Our virtues are exercised in the same kinds of action as gave rise to them…If is by refraining from pleasures that we become temperate, and it is when we have become temperate that we are most able to abstain from pleasures. Similarly with courage; it is by habituating ourselves to make light of alarming situations and to face them that we become brave, and it is when we have become brave that we shall be most able to face an alarming situation (Aristotle, The Nicomachean Ethics)
If you want more courage, you need to do things that REQUIRE courage. Reading about courage won’t make you brave. It is by doing things that require courage that you become courageous.