but what's OTA, RWY, STB...?

OTA: over the air broadcasts (from your antenna Vs Satellite or Cable)
RWY: Red, White, Yellow Composite cables (video and audio)
Composite: Lowest quality video all video carried on one RCA (yellow) with Left audio (white) Right audio (Red)
S-Video: (video only) carries video only divided into Luminance and Chrominance (?).
RW + S-V: Left/right audio + the use of an S-video cable.
Component: (video only) superior image over composite or S-video connections. Labeled Y,Cr,Cb, or Y,Pb,Pr Cable jackets will be red, green and blue. Required for HD video signals (1080-I resolution on 16.9 aspect ratios.
Although some like Standard definition signals better over S-Video. Depends on the signal and STB.

STB: Saw the ‘history’ of this term the other day, I believe traced originally to “Set Top Box” some people think its short for standalone table box.
Commonly used to refer to Satellite (and or cable) standalone decoder/receiver boxes at this time.

I always typing these things transposing them LBN LNB etc. there is a lot of shorthand used.