Fighting
On PC, WASD moves, the mouse aims, left click is the basic attack, and keys 1 through 4 are the four skills. Awakening has its own control once that fighter has it. Q is dash by default. Space jumps. Jump, then dash, is the longer super dash used to cross tiles. Shift lock is optional. Turn it off if you are trying to click PLAY, because a locked cursor walks off the button.
On mobile, the left stick moves and skills sit on the right. Dash is a labeled button, not a hidden swipe. Pinch out until you can see the boss's feet and your character. On console, use the Roblox gamepad overlay if slot 1 does not fire.
The current Roblox description says you can store and use up to three dashes in a row. Older notes only describe a single Q dash plus the jump-dash. Practice the stored dashes in Dimension 1 before you need them on a telegraph. Dash is the dodge. There is no separate invincibility key. Some skills list their own invincibility. Most basic attacks do not. A skill that locks you in place is a commitment.
Skills do not fire in the hub. If a button does nothing, you are on cooldown, in hitstun, or still in the lobby. Ping over 100 ms makes a real dash look late. Check the server before you reroll a trait over it.
HUD
CODES is on the left and locked until level 10. BAG opens characters, cards, pets, accessories, and Change Trait. PLAY leaves for Dimensions. Raid Shop, Boss Rush, and AFK Place are the other landmarks. Practice mode in the hub lets you try 1 through 4 without spending a Dimension.
Assists fire from their own button. You do not have to swap off the main fighter. Camera should sit slightly above and behind in a raid so telegraphs stay on screen. First person hides area attacks.