When learning how to deflect in Wo Long: Fallen Dynasty, practising on the weaker enemies where the consequences aren't as serious is important. You'll likely get hit a few times as you learn, perhaps even die, but you must learn the perfect moment to deflect attacks - or parry, riposte, counter, if you like - to make it far in the Soulslike game. It's also worth experimenting with the types of attacks you can deflect, as each time you successfully do so can make all the difference when taking down monstrous foes.
Of course, you've read the tutorial that explains that pressing the dodge button once while holding a movement direction has you deflect an oncoming attack. However, there's a big difference between knowing how to deflect in principle and executing it consistently, especially against the Wo Long bosses. These are the types of attacks you can deflect and why deflecting is essential to getting far in the RPG game.
RELATED LINKS:
Best Wo Long: Fallen Dynasty spells
All Wo Long Dragon Vein Crystal and Essence locations
Wo Long Shitieshou demon locations and how to feed the pandas