General Resources
Some dangerous dogmas about modding that you should be aware of.
An introduction to xEdit and its use.
A full guide to The Method conflict resolution.
SSE Resources
The official series of Creation Kit tutorials.
General information on LOD and how to generate it with FO4LODgen, TexGen, and xEdit.
All you need to know about ESL plugins and how to flag your load order ESL in batch.
A huge wiki on everything to know about LOD and the tools involved.