So, I FINALLY got to the point where I can how get through the Green Forcefields. Don't bother searching for a way around them, you need to complete a mission with Merrin. She gives you a charm that lets you dash through the force fields. So, when you encounter one, just walk away, there is no getting around it.
I still have not found a way to get through those yellow doors that have a crack in them. I tried the exploding roller mines, but nope.
Also, the weird rocky spiderweb stuff can only be burned away with a tool you get for BD1, again on a story mission.
At this point, I have I think all but 3 of the locked paths open. I still don't have the thing I need for those weird electrical looking ball things, which is a BD1 thing. And the yellow doors, and then finally those objects that are just too big/heavy to move. I think you have to learn some force power to get those open.