Poker psychology and mindset information and tips

Hi all!
Please, share in this thread your favourite articles, sources of information and videos about poker mindset and psychology which helped you the most or which you found the most useful for yourself. I'm particularly talking about online poker.
Thanks!

This video is not only funny, because my compatriots Alejandro "Pappo" Lococo and Ivan "Negriin" Luca are very entertaining characters, and they are also very good poker players, both online and live.
Also in the video I learned a lot how to play online, how to pay bluffs or semi-bluffs. You always learn something new by watching videos.
I hope you can translate it into your language.
Cheers