I’ve gotten a lot of questions about this so here we go. The very very basics.
1) Find a quiet place. Somewhere you will be alone and undisturbed.
2) Learn to sit still. This will take time.
3) Clear your mind. Or try for as long as you can.
4) This won’t always be possible. Your mind will wander. That’s okay. Let it do its thing.
5) Try to make at least 10 minutes a day for doing this. Eventually you will be able to clear your mind without even trying.