Is Hall of Legends a career?

No. It is historic scenarios and showcase fights, not your own climb.

Can I learn the game here?

You can feel a fighter. You still need Practice Mode for deny, check, and clinch windows.

EA has used sets like Holloway, Pereira, and Zhang. The in-game list is the source of truth after patches.

Try other fighters and set-piece fights without leveling a career.

What Hall of Legends is in UFC 6: historic fights and other people's fighters without a career grind.