Mostly the title. I have experience with Python, and I was thinking of learning more about data compression. How should I proceed? And what are some good books I could read, both about specifics and abstracts of data compression, data management, data in general.

I am looking for any resource that could tell me how much knowledge and training is needed to go from a beginner to expert, in let's say application software development for example. Or in artificial intelligence.

If there isn't any one source, are there any general type of sources I can use to piece together one mega-source?

First off, I've noticed a lot of D&D chatter on here, so I figured you all would be a great resource for this. I've never played D&D but after listening to some of The Adventure Zone, I'm really getting into the idea. I want to play with a group of friends, but there are a few people who have never really played an RPG and get somewhat self-conscious playing things like board games. Any recommendations for a good starting point for this sort of situation?

So I've nearly finished my exams and am going to have a bunch of free time soon. I want to try and learn to do some electronics stuff. I already have an Arduino and Pi and have done the basic flashing lights projects, but want to try something a bit more interesting (but not too expensive either)