Understand React.js in 1 Minute and 58 Seconds
Too Long; Didn't ReadTo start using a tool, you start with a problem it solves and learn what the tool's Concept(s) are to solve the problem.
Don't keep implementation in your head like "how to do something with a tool", it's complicated and everything won't fit in your head anyway. Google implementations, remember ideas.
After 5 times of googling an implementation, you will remember it. Then the technology will become obsolete and you will forget it, it's okay, it happens all the time.
Ideas are hard to forget, they fit in your memory for a long time.