One user can host one meeting at a time. Even if you can get Zoom to schedule 2 overlapping meetings, if one meeting is active and you go to start a second meeting, you’ll be prompted to cancel the other meeting before continuing.
With Business and Enterprise accounts, a user can be given permission to schedule meetings for others, but can still only host one meeting at a time for any individual user.
With your Pro account, you can have 2 or more users (up to 10), and each can host meeting at the same time.