[AncientPC]

Most sites support up to 3 or 4 tables, you just go back to the lobby and open up another table. Once you reach that limit you open up a second site and add on more tables, usually this requires a second monitor unless you like switching between windows a lot.

I got too bored playing one table, as most of the time is spent folding hands and after I get bored I tend to start playing looser and looser. With more tables it can keep me focused without going on tilt. Most people start out with 1 and work their way up as they feel comfortable.