As rewarding as using Twine was to work with for me, working on any project is a time investment. I need to be getting things in return for my work and might not return to Twine specifically (I do still intend to make visual/novels though).
That said, I still want to be a part of something I value. So here are some resources aside from the actual Twine website/documentation I know others will find useful.
Hiev's Sample Code. How to do just about anything with Surgarcube not listed in the offical Sugaracube Documentation.
Almost any CSS tutorial applies to Twine. For my specific recommendation, W3schools is great for quick searches.
Here's the base CSS I used in MANIASCAPE for use in whatever you need. (Note: it was designed for Surgarcane in Twine 1.4. Also sorry about the font color. I don't know what to do abou it.)