Lack of High-level XCM explanations

I was doing a research about how can I transfer non-native tokens between parachains on some high level(e.g. using Polkadot.js UI) and met a problem, that there are not much of it. I found good video, but it has bad quality and some things are also not explained. Also I was trying to understand how these things are working, but most of tutorials are more like “copy this, paste here and it will work”, so I’m wondering, why we have so small amount of resources for some new users?