Self-directed learning.
HOW TO START
"I want to learn [skill]. I know nothing about it. What should I learn first, in what order, and what should I practise?"
Then work through it, asking questions.
WHAT IT CANNOT REPLACE
Practice. Reading about a skill is not having it.
FOR REVIEWING YOUR ATTEMPTS
"Here is what I produced. What is wrong with it?"
Ask for problems, not praise.
THE SCEPTICISM TO KEEP
In an unfamiliar field you cannot evaluate the explanation.
Verify against a proper source for anything that matters.
FOR TECHNICAL SKILLS
Test everything. A confident explanation of a command that does something else is a real risk.
FOR DEMONSTRABLE SKILLS
Build something. A portfolio beats a claim.
WHAT EMPLOYERS ACTUALLY ASSESS
What you can do, demonstrated.
Not what you have read about.
THE HONEST MEASURE
Could you do it without the tool?