Jangama Dhyana is the name that my guru and my guru’s guru used to describe a timeless technique implemented by yogis over the millennia. It’s the most simple and direct form of meditation, common to zen and buddhists as well.
Sit, closing the eyes.
Concentrate the mind and sight in between eyebrows.
Keep watching there by focusing the attention.
Do not repeat any mantra or name.
Do not imagine anything.
Do not open eyes until the duration of meditation - 30 minutes, 45 minutes, 1 hour - is over.
This technique is all you need for liberation. Everything else is commentary.