Most NBA and WNBA teams use Ticketmaster as their primary box office. These are "primary" tickets sold directly by the team.
Many courtside seats include access to private VIP lounges, complimentary high-end food and drinks, and dedicated waitstaff who deliver orders directly to your seat.
If you want a specific game or a high-profile matchup (e.g., Lakers vs. Celtics), buy as soon as tickets are released to the public.