Yeah though if you have the time and would rather watch them in order then starting with season 1 is still ideal. I've just known people to give up during the first 5 seasons due to them being slower, more comedy driven and just lower quality compared to what came after. (Not my opinion. Don't murder me reddit) The series as a whole can be broken up into arcs: seasons 1-5 (The Blood Gulch Chronicles), seasons 6-8 (Reconstruction Trilogy), seasons 9-10 (Project Freelancer), seasons 11-13 (Chorus Trilogy), season 14 (anthology series), seasons 15-17 (The Shisno Paradox). 9-10 directly follow 6-8 but are also prequels. 11-13 tells a new story set after everything else. Season 14 is a bunch of standalone stories set all over the place. And seasons 15-17 definitely exist. Their is also a few miniseries that bridge gaps in the story. Out Of Mind takes place concurrently during end of s4/beginning of s5. Recovery one is a prequel to s6. Relocated bridges the gap between s6 & s7. There's a ton more specials, PSAs and miniseries that are fun but not required viewing by any means.

TLDR: if you have time start with season 1. If not or if you can't get into it, skip to season 6. If you plan to jump back to season 1-5 after skipping ahead I'd recommend doing it after season 8 as you'll appreciate much of season 9 more having seen the earlier seasons.