For the past few years I’ve been dabbling on and off with the LE, but the tutorials I found were a bit confusing. However, I’ve found some amazing tutorials on YouTube, they are the easiest to follow that I’ve found:
Please be aware that these tutorials are for the old Tomb Raider Level Editor. I had issues running it on my laptop as it’s very old, so you may want to try the new Tomb Editor, instead.