Hit the books
To study hard.

Learn the ropes
To learn the basics of something.

A quick study
Someone who learns things fast.

Burn the midnight oil
To study or work late into the night.

You can’t teach an old dog new tricks
It is hard to change someone’s habits or teach them new skills, especially when they’re old.

Learn by heart
To memorize something.

School of hard knocks
Learning through difficult or tough experiences in life.

Teach someone a lesson
To punish someone so they won’t repeat a mistake.

Book smart
Someone who is intelligent due to studying, rather than from practical experience.

Street smart
Someone who has practical knowledge and knows how to deal with real-life situations.

Old school
Someone or something traditional or old-fashioned.

Learn the hard way
To learn something through experience, usually after making mistakes.

An old head on young shoulders
A young person who acts or speaks like someone with more experience.

Knowledge is power
Having knowledge gives one power and control in life.

Live and learn
Learning from your mistakes.

Learn something by osmosis
To learn something unconsciously, without direct teaching.

Learn the ins and outs
To learn all the details of something.

Ahead of the curve
To have more knowledge or skills than others.

Teach an old dog new tricks
To try to teach someone new skills who is set in their ways.

Make the grade
To meet the required standard of success.