Angee,

How many times are you going to ask the same question?

You've asked:

"18-55 IS STM (kit lens) vs 75-300 iii telephoto" on Sept. 22.
"What Lens???" on Sept. 23.
"Canon Lens Questions" today, Sept. 24.

The answers haven't changed. They're still the same!

The EF-S 55-250mm IS STM "renewed" lens you found on Amazon looks like a really good deal.

In the description Amazon explains exactly what "renewed" means. It's simply a used lens. They don't exactly say who, but someone has inspected it for condition, proper function and, if necessary, cleaned it. They offer a 90 day "store" warranty on it. Amazon will repair or (more likely) replace the lens if it fails during that time period. This is basically the same as buying used from B&H Photo, Adorama, KEH.com and a number of other reputable sources for used gear.

It is different from buying "refurbished" from Canon. "Factory refurbished" from Canon USA have a full 1 year warranty, same as new. Refurbished lenses also may have been used... but may be demo units that saw little real use, were displayed in a store or at a trade show... Might even be brand new items in shelf-worn boxes. Or they could just be returned overstock or back stock in Canon's own distribution network. Of course, it also could be an item that was returned due to a fault, has been repaired by the techs trained and equipped to do so by Canon themselves and using "genuine" Canon parts. In a sense, "refurbished" may even be better than new.... Could very well have gotten more hands-on inspection and individual attention than a brand new item going through a quick quality control check after coming off the assembly line.

Both Canon USA and Amazon (direct) are good about replacing an item or even accepting an outright returned item if you decide you don't want it for some reason within a week or two of purchase.

That "renewed" lens on Amazon looks to be a pretty good deal at $140. That lens sells for $299 new and $240 refurbished.

Your other question in your other post, relates to the filter thread size of lenses.

Your Canon EOS Rebel SL2 is an interchangeable lens camera... The camera itself does not have a filter thread.

The EF-S 18-55mm kit lens that you got with your SL2 has a 58mm filter thread. This is merely the diameter of filter you would need to buy, should you choose too use on on that lens (Note: Circular polarizers are by far the most useful filters for digital photography. Virtually all other filters... and there are dozens of types... are completely unnecessary or only needed for specialized purposes.)

The EF-S 55-250mm IS STM lens you are considering also uses a 58mm filter. In other words, the two lenses can easily share a filter, since you can only use one lens on the camera at a time.

The other lens you ask about, the Canon EF 50mm f/1.8 STM, is smaller. It's a "fast" lens, meaning that it has a larger maximum aperture. It's f/1.8 setting allows in over 4X the light the f/4 of your 18-55mm (at 18mm) or the 55-250mm (at 55mm).... or over 8X the light those other lenses allow in at f/5.6 (18-55mm at 55mm or 55-250mm at 250mm).

This will be good for low light situations. It also will make for nice background blur effects (shallow depth of field), which can be useful for portraits.

The EF 50mm f/1.8 STM lens uses a smaller 49mm filter. So it will not be able to easily share filters with the other two lenses. The best thing would be to buy the correct size for this lens, if you feel the need for a filter on it. (Portraiture and low light shooting generally don't require any filters.)

There is a way to use oversize filters on lenses... inexpensive "step rings". This is simply a ring that has one size of threads on one side and a different size on the other. To use a 58mm filter on a lens with 49mm filter threads you'd need a 58mm to 49mm step ring. HOWEVER, there's a down side to using step rings. You can't use the standard lens hood with the step ring. And, in my opinion, the lens hood is much more important (they improve images AND physically protect the lens... they also protect the filter from breakage and shade it from the sun, if using a filter). Personally I avoid using step rings for this reason. I just buy the correct size filter for my lenses with different diameters.

The EF 50mm f/1.8 STM lens on an APS-C camera will act as a short telephoto... ideal for portraiture and a lot of other things.

It's not a "standard" or "normal" lens (neither telephoto nor wide angle), the way a 50mm lens is on "full frame" cameras.

If you are looking for a standard/normal lens, a better choice might be Canon's EF-S 24mm f/2.8 STM ($120 refurbished)... which is a "slightly wide normal". This is an especially compact "pancake" lens, too. Canon's EF 28mm f/1.8 USM or Sigma's 30mm f/1.4 lenses are both closer to "normal" lenses when used on a camera like yours... but are also considerably more expensive, bigger and heavier.

All these lenses can serve you well. The only other thing I'd encourage you to do is to by the "matched" lens hood for each of them... and use it! Canon lenses (other than the L-series), don't come with lens hoods. They're sold separately. Your EF-S 18-55mm lens uses "EW-63C" lens hood. The EF-S 55-250mm IS STM lens uses "ET-63" lens hood. And the 50mm f/1.8 STM lens uses "ES-68" (Note: This lens has a fairly recessed front element, so might not need a lens hood for regular use... though I'd recommend one if planning to use a filter or for better physical protection of the lens.) Canon's OEM hoods typically cost at least $24 apiece. There are third party manufacturers offering "clones" for a lot less. Vello, JCC and others sell similar "dedicated" hoods that probably work just as well, for about 1/3 less or half the price of Canon OEM.

All these lenses can serve you for a long time. They may be all you ever need and are quite capable. The photographer's knowledge and skill are more important than the camera and lens. You might find other things you want to do and may want to add some other lenses in the future. In previous post you asked about doing macro and close-up photography... and to an extent you can do that with the above lenses along with a set of macro extension tubes. However, if you really enjoy it and find yourself doing a lot of macro work, you might eventually want to add a true macro lens. There are a number of those available (Canon themselves make a half dozen or so, including the compact EF-S 60mm f/2.8 USM). Or, perhaps you'll decide you want a wider lens to be able to take more panoramic landscape photos or capture expansive building interiors (one option is Canon's relatively inexpensive, but quite good EF-S 10-18mm IS STM lens). Or maybe you will find you need a portable flash... the ones built into cameras are wimpy, in the worst possible place for redeye problems, and draw heavily on the camera's battery.

I would suggest you don't get too many lenses or accessories to start, though. Two or three lenses, tops. Work with them for a while. Find out what you like to do. Then add or change if you need to. Don't overwhelm yourself with too much, too soon! You would be better learning what to use when and how to use it well... and this comes with experience and practice. To speed things up you might want to take a basic class locally or online and buy some books:
https://www.amazon.com/David-Buschs-Canon-Digital-Photography/dp/1681983389/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=
https://www.amazon.com/Understanding-Exposure-Fourth-Photographs-Camera/dp/1607748509/ref=sr_1_1?

Back when we were shooting film, most of use passed it off to someone who developed and printed it. Today with digital, we do most of that ourselves. Your camera came with software that can be used to organize and work with the photos you take. But you might find other software, such as Adobe Elements 2019 more of an "all in one" solution and easier to use. This is an add'l cost, of course... plus it takes a little while to learn to use it well. (Again, classes and books are available... but there's a lot of support built right into Elements.)

Have fun!

P.S. I'm going to copy this to your other post, too, where you are requesting essentially the same info.

Angee, you already have a lens covering 50mm in your 18-55 lens that came with your SL2. In one of your posts you mentioned mobility issues. A prime lens requires that you move around to frame your shoots, sometimes referred to as 'zooming with your feet'. I personally find my EF 50mm f/1.8 to be one of favorites lenses due to the smallish size and lite weight and incredible sharpness; but for your situation, it would seem this is not the best option as well as being redundant to your current 18-55. To add 'reach' to your camera beyond the 18-55 lens that you already own, look instead at the 55-250 as the next purchase.

Those tubes look just fine. Remember all Canon EF and EFs mount accessories will fit your camera just fine. These appear to have the contacts so the aperture etc should function as well just fine.
the 58mm is the front filter thread diameter of your lens and is irrelevant to extension tubes. For now do not bother with reversing the lenses and use and learn the extension tubes. Again, what you posted look just fine as they are EF mount and will work fine with every EF, EFs, M and RF mount Canon camera ever made. (M and RF will need an adapter but once mounted you still get 100% operability with Canon).

I bought a cheap set of extension rings of ebay about £8. They didn't have any electrical contacts so you have to shoot in manual - which I found OK for table / tripod top set ups. The only downside was the threads on the rings were a bit rough. I lubricated them with vaseline (petroleum jelly) wiped off the excess and washed my hands before touching the camera. That solved the problem of them being a bit stiff to connect.
At a fraction of the cost of the dedicated ones with the contacts ....it is a great way 'try' macro.
I also experimented with a step down ring to reverse a lens onto another lens....it works but not as simple as using extension tubes.

for the sake of a few pounds .....the cheap plastic ones do work!

You need to get the extension tubes to match your camera....as it has to slide and twist on as any other lens.

have fun