Photoshop

I need a bit of help as i'm new to birding and photography  and as i'm now semi retired and have a lot of time on my hands its something I want to get into. However I would also like to get into editing my photos and this is where I need the help. what Photoshop product should I get to do the basic editing.

When searching the internet it looks like I could spend the best part of £3billion on Photoshop as there seems to be so much of it.