In order to avoid or break through illusions of competence, you should test yourself as you’re encountering new material. 

Recall is a simple example of this mini-testing.

When facing procrastination, think of the process over the product.

Instead of thinking that you have to get X done, rather think to spend an hour on X. It is then not overwhelming, and doesn't require a long breakdown of tasks.

There are many ways in which we can make ourselves feel like we have “learned” a concept.

Instead of highlighting or underlining, rather take brief notes that summarize keys concepts.

Once you have a basic understanding of what you are trying to learn, practice jumping back and forth between problems that require different techniques. This will solidify your understanding of the concepts by learning how to choose to apply them in various situations. 

When learning, there are times in which you are focused and times in which you allow your mind to wander. Both modes are valuable to allow your brain to learn something.

Take regular breaks, meditate, think about other things, and give yourself plenty of time in both modes....

Do not spend too much time in one sitting going over the same material over and over again. The law of diminishing returns certainly applies. Spread it out over many sessions and over many different modes of learning.

... have proven to be most beneficial to maintain continued progress and hold each other accountable. Finding the right group is key.

They are often talked about as helpful study techniques. 

Try to make a deliberate effort to teach what you learn to someone else and, in doing so, you will likely be forced to explain concepts with relatable metaphors and analogies.