How does the human brain develop telekinesis?

Whether it's the brain or the observer that accesses reality through that brain that's the one who does it is controversial even amongst Mystics.

It can be done though.

You can check Grandmaster Wolf who also has some free material to look into.

Be careful not to fall into con artists thought, no need to buy books or special courses to learn it. People throught History have been documented to have learned it alone, it's a natural consequence just like when in a social circle it's natural to learn to walk eventually.