Looking for the BEST Online Estimating Course - Tried a few and...

I've been out of the game for a while and want something that serves as a good refresher. Most courses are basically Estimating for Dummies and very beginner level. I would love something that deals with the entire bidding process start to finish.

I can't remember which site I tried the course at (Udemy or Coursera). Some of the courses absolutely sucked. Others were okay but as mentioned very beginner level. Sadly, it's basically the same as what you get from a local college.

I imagine that it's hard to find good instruction because being an actual real successful estimator probably means not having time to put together a course. And for the in-person courses, it quickly becomes quite clear that the instructors are hiding from the real world (either due to not being good enough or just avoiding the stress).

Long story short: It's hard to learn/review estimating at an advanced level. If you know of any resources, even a book (have a couple and they're okay) please share!!

Thanks!