I know about two forms of meditation: mindfulness meditation and transcendental meditation. They're both pretty much exactly the same, except in mindfulness meditation, you focus on your breath traveling through the tips of your nostrils, and in transcendental meditation, you focus on a sound/word/phrase in your head.

This guy explains transcendental meditation really well. If you want to try mindfulness meditation, then just change his instructions to focus on your breath instead of a sound, and keep the rest of the instructions exactly as they are: https://youtu.be/nBCsFuoFRp8

One thing to note is that there's transcendental meditation, and then there's Transcendental Meditation™. They're the same exact thing, except with with transcendental meditation, you pick whatever sound you want, but with Transcendental Meditation™, you pay $1600 to have some dude sprinkle a bunch of essential oils or some shit on you and pick your sound for you. Plus, who knows what kind of recurring hidden fee nonsense you're signing up for, so I suggest avoiding Transcendental Meditation™.