Just got my General ticket and excited to try 20 meters! I've heard it's great for DX, but I'm confused about exactly where I can operate. I see the band is 14.000-14.350 MHz, but where should I actually tune for voice? And are there any frequencies I should avoid as a new operator?

The ARRL has a detailed band plan for US hams showing allocations within each band. For 20m voice, stay in the phone segment from 14.150-14.350 MHz, but most experienced hams try to stay at least a few kHz inside the band edges.

Great question! Phone operation on 20m starts at 14.150 MHz and goes to the band edge at 14.350. Below 14.150 is for CW and digital modes only.

You should not set your transmit frequency to be exactly at the edge of an amateur band or sub-band to allow for calibration error, modulation sidebands, and frequency drift. I usually start around 14.160 and avoid the DX window around 14.200-14.230 unless I'm working serious DX.