In general, you should combine all these methods to make full use of your ability to learn. Alternating between learning methods is also called interleaving. And don’t forget to get enough sleep.
If you want to practice your ability to focus, the pomodoro method, combined with working process-oriented is a good exercise.
To learn a new skill, chunking and spaced repetition are recommended methods, as well as recall. If your focus is well trained, you should the exhaustive deliberate practice method. You can as well to try to prime your dreams.
A common technique to memorize large amounts of items it the memory palace techniqe.
Most of things that distract us are bad habits. But also learning and focusing can be a habit. How to change habits is described here.