Some common abbreviations on that radio are:
ST steering
TH throttle
EPA end points adjustments for TH, ST and other channels
V volts for the cars battery or radio battery. (With that radio you can do 6 AA or 2 to 4s lipo. I would recommend to find a lipo which will last longer than the AAs. )
Gyro helps you steer if you get out of control
And there is a lot of others I am forgetting (I have the RC4GS V3)
That beginner place would be the manual. Or watch youtube reviews on that radio.
The manuals are on the Radiolink website
https://www.radiolink.com/rc6gsv3
Imo it's pretty easy to operate. To open all the settings I think you have to press both buttons on the end. (Enter and exit I believe)
There is also settings to set all those buttons to different things or channels.