Disclaimer: Before you deep dive into the world of productivity, I highly recommend reading some principles here LINK
Understand your natural sleep-wake cycle (chronotype): A person's natural sleep-wake cycle. There are four main chronotypes: early risers, late risers, intermediate risers, and night owls.
Deep work: A state of intense focus and concentration that allows you to accomplish difficult tasks.
Remember to rest
Connect with nature
Don't hoard vacation time
Do something else
Motivation: A key to understanding what drives you and others
Multitasking doesn't exist: If possible focus on one thing, otherwise you're losing energy
How the brain likes to learn: Everyone's brain learns differently, so you need to find the best way for you to learn.
Smart learning technics: (?)
mnemonics
mind maps
Take care of your work environment (desk, smartphone, wall colors, noise, window view, office space etc.)
Keep an eye on how much time you spend on social media
Health, nutrition, movement (hybrid work, partly standing)
Eat the frog: the art of doing the hardest tasks first
Inbox zero: The practice of clearing your email inbox to zero at the end of each day.
Listening to music (some genres help you focus and some not)
Create your system
Be careful with communicators (Slack, MS Teams, Discord, etc.)
Write down things to do, don't keep them in your head
To-do list
Power naps: A short nap, typically lasting 15-30 minutes.
Take notes, gather knowledge - build your own Wiki ;)
5 Why: A problem-solving technique that involves asking "why?" around five times to get to the root cause of a problem.
Automation of repetitive tasks