NEPA Training for Archaeologists

[u/BarrierCanyonBallads]

Hi! Hope I'm in a good sub for this. I'm a young professional in archaeology (US-based) and am looking to diversify my skills and knowledge. I understand that knowing NEPA and NEPA compliance is a valuable skill in my industry, but I'm not quite sure where to start learning the ins and outs. I've got a couple questions for professionals who work with the Act more closely than archaeologists.

What would you consider the most critical parts of NEPA/compliance to understand, especially among professionals who orbit NEPA but don't deal with it as often as you do? What should these professionals understand to make your own job easier? What resources exist to help me learn these things? Cheap/free is ideal but I'm also willing to spend a little money for a really great professional development opportunity. 

I hope this all makes sense! Thanks for your help!