some questions

[Taika]

when I go in dugeons with other players, ask me to use the ability "Flash", but I did not understand what is it, I'll explain in a simple way?

As a gladiator (and paladin in future), your role is to tank enemies (as in make sure all the enemies are on you and not your party members). For multiple enemies, Flash is your main tool for keeping their enmity and at low level you should spam it as much as your MP allows you to (when you run out of MP, you can use Fast Blade --> Riot Blade combo to recover it, but only after you have secured hate).

At your current level, you should start each pull with Shield Lob on one monster, then run to the monster group and use Flash a couple of times (or more if needed). If the group is killing one monster at a time, you can focus on it and use Fast Blade --> Savage Blade combo on it to build enmity and do damage. Use Flight or Flight to boost your damage (and, at the same time, enmity). Even when focusing on killing one monster at a time, tab through enemies to check your enmity levels compared to other group members. If you lose one monster, use Provoke + Shield Lob to pull it back (Provoke will only put you at the same level with the person with highest enmity, so that alone will not get it back to you). Don't forget to use your defensive cooldowns!

And most importantly, keep your gear up to date! If you're entering a level 15 dungeon, make sure your gear is close to level 15, especially your weapon. Remember to also do your class quests every 5 levels to get your abilities.