Im going to go against the grain and say that you should shoot with whatever format you find easier to work with.

The downside to raw is that it's a two step process. If you're a beginner, you might not have settled in on a workflow and may find that RAW files might be too cumbersome to work with.

I prefer RAW, and I generally think it's the better choice, but as a beginner, there are far more important things that should take your attention instead of editors, and file formats.

A RAW file isn't going to save your images from being boring, from being out of focus, or for being just plain bad. If you spend your time trying to retouch so-so looking photos just because you can, you'll miss out on learning how to take good photos first!

Said another way, a properly exposed jpeg looks far better than a mediocre photo shot with RAW.

Learning proper exposure techniques, framing, subject, and artistry are so much more important.

I think it's a fun exercise to go back and rework old images using new techniques, but I don't think its something that should be encouraged. Better to go out and take new photographs, than toil away and rehashing old ones. In my most humblest of opinions of course.