Many people think they're separated from their goals by their ability to retain and recall information.
Unless your only goal is to win trivia games, you're wrong.
"What techniques should I use?"
"What books should I read on learning?"
My suggestion: don't do any of those things, start a project that forces you to produce something.
If you're obtaining information in the context of a project that creates an output - it suddenly becomes much more useful.
Now you've read this, it shouldn't.
I want to help people learn x.
I want to help x businesses solve y.
I want to help people like me get z.
It's OK to decide the first thing you tried isn't the thing you want to keep doing forever. (it won't be)
It's OK to admit you don't know everything about everything. (you can't)
Just do something.