Really need more in depth tutorials. All I can find that is recent is
https://www.sidefx.com/tutorials/uv-flatten/ [sidefx.com]
which only covers uv flatten

Help please!

While there are now more tools that make it easier (UV flatten being one), I can recommend checking these out:

https://vimeo.com/12547162 [vimeo.com]
https://vimeo.com/12547587 [vimeo.com]
https://vimeo.com/12547985 [vimeo.com]
https://vimeo.com/12548160 [vimeo.com]

also this one:
https://vimeo.com/42774724 [vimeo.com]

let me know if you find anymore

This one I made is not just for UVs but talks a bit about the importance of using parametric surfaces for the purpose of UV generation. In all honestly, if your procedural modeling is very strong, you can get away with just using the UV Texture SOP and a few Vertex wrangles (I use those the majority of the time)

https://www.youtube.com/watch?v=J-onjB5Lars&list=PLjOCJrhSBGUG9uqJ2rMe6ByLJcTD9Jau7&index=24 [youtube.com]

and the play list if you want to see the context of that tutorial

https://www.youtube.com/playlist?list=PLjOCJrhSBGUG9uqJ2rMe6ByLJcTD9Jau7 [youtube.com]

if you are dealing with stuff that has already being hand modeled, UV Flatten and UV Layout can really help