Here is one that pretty much outlines almost all the basics that I use most often:
https://www.motoslave.net/sugarcube/2/docs/
and here's a reddit thread of other sites that are helpful:
https://www.reddit.com/r/twinegames/comments/au74yc/collection_of_tutorials_ive_...
hope this helps. otherwise there's many forum posts that are helpful in coding. good luck :]