One Piece: Get Stronger by Watching Battles

Zhou Ze transmigrated to the world of One Piece with a system called "Peerless Martial Arts Master".
With the system's capabilities, he can learn any move from anyone after just one viewing.
Garp's Iron Fist, Hawkeye's swordsmanship, Luffy's Gum-Gum Battle Axe, Zoro's Three-Sword Style, etc., are all easy to learn at a glance.
Zhou Ze always felt he needed to play it safe, otherwise he would easily get killed.
One day, after making a move, I suddenly discovered that...
I'm so competitive!
Everyone said: We already knew!