95% of what you need in Photoshop you can learn in an hour by trial and error. First thing to learn is to crop a picture. Crop is a choice in the Image tab on the top of the screen. Just pull inwards on the corners of the frame to get the crop you want. In the image tab on top of the screen you can left click on auto tone, auto color and auto contrast to improve your picture. If you don't like any of those three effects go to the edit tab and hit the undo choice, it will undo the last thing you did. You can then go to the image tab and select Adjustments which will open a new menu where you can select brightness and contrast, vibrance and shadows and highlights. All of these choices have sliders that you can use to adjust your picture and see the results as you do it. When you are happy, go to the File tab and select Save As, and rename your pic. This way your changes are on the newly renamed pic and the original will be unchanged in case you want to try different effects on the original pic.
P.S. When you open a raw file in Photoshop it opens in a Camera Raw window. You don't have to make any changes there, just click on Open Image, and it will open in the Photoshop window. Any adjustments available in the Camera Raw window can be performed in the Photoshop window. The first three effects I try on any raw image once it is opened in the Photoshop window is the auto tone, auto contrast, and auto color described above. Just those three clicks make a big difference. After each one, if I don't like the effect, I can undo it as described above.

With 8 MB I could open a RAW file and it would take about 5 seconds to open. Working with the one file was no problem. Changes were immediate, developing took a few seconds etc. However, when I decided to work on a few files at one sitting, the delays were longer. The increase in memory reduced those delays. If you go to the Affinity Photo Forum, there is a mixed bag of responses to upgrading memory. My delays were nothing like others have experienced. I just was sent an update -1.6.4.140. Runs fine.

With 8 MB I could open a RAW file and it would take about 5 seconds to open. Working with the one file was no problem. Changes were immediate, developing took a few seconds etc. However, when I decided to work on a few files at one sitting, the delays were longer. The increase in memory reduced those delays. If you go to the Affinity Photo Forum, there is a mixed bag of responses to upgrading memory. My delays were nothing like others have experienced. I just was sent an update -1.6.4.140. Runs fine.