Git!!

cheat sheet: https://services.github.com/on-demand/downloads/github-git-cheat-sheet.pdf

Katas y sitios de katas

que es una kata: https://en.wikipedia.org/wiki/Kata_(programming)
kata de repaso: https://www.w3schools.com/php/exercise.asp?filename=exercise_syntax1 https://www.w3schools.com/php/exercise.asp?filename=exercise_syntax2 https://www.w3schools.com/php/exercise.asp?filename=exercise_syntax5
kata sintaxis: https://www.codewars.com/kata/fix-the-bugs-syntax-my-first-kata/train/php