The most comprehensive guide is the Code of Points (CoP in short) which you can download as PDF here (the one titled WAG CoP 2013-2016). It has every single skill there is and its start value, and judge’s guides for specific apparatus, connections, composition requirements, execution guidelines etc. It uses only technical names for skills, but at the very end you can find the trivial names too (literally the last pages).
It is a bit difficult to read if you’re just starting, for example, something that most people would call toe-on stalder with or without half turn is described as: pike sole circle bwd to hstd, also with hop-grip change to reverse grip in hstd phase, also with ½ turn. So I’m guessing this is what you meant when you said “lost with technical names”? So instead of focusing on the skill descriptions (PART IV Table of Elements), look for the PART III. When I first got into gymnastics, I found this section very useful. For example, you know what beam routine should be like (not just skills, but everything) and what switch ring needs to look like to not be devalued or deducted.
But because of the difficulty of CoP that I mentioned before, it’s probably easier for you to learn the skills by seeing them performed. For this purpose there are a few excellent fan made skill guides with gifs. The gymnastics wiki has hundreds of gifs of different skills so you can see exactly what something looks like. It is well categorized too and has both the technical and trivial names for skills.
Here are the links for different apparatus: vault, uneven bars, balance beam, floor exercise.
Another source for skills with accompanying gifs is the blog of thepushyqueenofsluttown and her separate blog for skill guides. She has lots and lots of technical knowledge and you can send all of your questions to her ask and cross your fingers and toes for an answer (as everybody asks her stuff, she obviously doesn’t have time to answer everything, but you can always try), if you get one, it’s very educative and in-depth.
Then there’s obviously Youtube. In my opinion, the best way to start learning skill names is watching your favorite gymnasts’ routines and learning the skills they have and the place to do that is Youtube. Just search the name of your favorite gymnast and D-score together and you find videos of routines with every skill named and valued separately, then counted connection bonus and the final D-value of the routine. You can also search for a routine on specific apparatus and year, just add those in your search words. They have technical and trivial names all mixed up just like tumblr, so it might get a bit confusing on that department.
These videos are a great way to start learning skills. As I said, you can just search with the name of the gymnast and videos from different users will show up, but my favorite channel is sporteverywhere. In addition to these D-score guides, they have other good and educative gymnastics content.
I’d start with Youtube. Just watch your favorite routines and learn the skills from those. In this way you also quickly learn what skills the modern gymnasts use at elite level (most skills in the CoP are used very rarely at elite level). After getting familiarized with them, you can check out the skill guides for more and use the CoP as reference.
I hope this helped! You can always ask if there’s something else I can help you with. :)