It is impossible to avoid failures in life. Don't be afraid of them. Consider rather how to learn from your own failures.

Telling the truth is less demanding than telling a lie.

It is equally important to learn from experience and from books.

Concerning mistakes, follow three simple rules. Firstly, correct a mistake that you made whenever it is possible. Secondly, don't repeat the same mistakes. Thirdly, learn from past mistakes

The best advice will come from the person who has no personal interest in the matter.

Knowledge can be acquired by education, reading, communicating and observing, but also simply by living.