I always recommend that noobs start with the "XYZ" For Dummies books. Once you have some basics, start reading the next level of books. As your learning curve increases, head for the books on the topics that interest you (Equities? Options? ETFs? Mutual funds? CEFs? ). Go easy on much more than dabbling. The market usually separates beginners from their money quickly.
I would post any question here that you want. As long as it doesn't violate the rules, go for it. Unfortunately, the membership here isn't that high/active. Some other sites that provide the the ability to do Q&A are Elite Trader, Silicon Investor, Seeking Alpha. Yahoo Finance used to have some good BBs but they withered on the vine (I have no clue if they are active or dead now). It's not that one is better than the other but a case of finding others interested in what interests you.
I was a mostly B&H investor for 20 years before branching out. This was before the internet. Even though I had a more than full time day job, I still read frequently (you never stop learning with the markets). 15+ years ago, trading began to interest me. I joined a number of free trading rooms on of all places, Paypal. When I learned what they had to offer, I moved on. Eventually it all coalesces and you get a feel for what you can and can't do.
The ultimate feedback is your performance. Are your investments matching or outperforming the market? Is your trading generating a profit? The only infallible investing/trading indicator is the value of your position. It never lies. Hindsight tells you if you are doing the right things.
I bailed out of most of my long holding in late 2007 after giving back 10% of 6 years of investment gains and I then traded a lot on the short side for almost two years. I did it again 3 weeks ago. In neither case did I predict or know what was to come. I just got to the point that I didn't want to give back years of gains. Keeping it became more important than making it, though I don't object to some of the latter. So far, I'm 10% right in the past month. And even if the correction didn't occur, it was the right thing for my piece of mind. So don't be afraid to make decisions that aren't always right. And try to avoid as many of the really wrong decisions as possible (employ disciplined risk management). AFAIC, trade not to lose and the rest will take care of itself :->)