How do you communicate during games without a radio? Basic signals and callouts for beginners

I think all of this depends on each person, if you play in a group you can make your own signals but I'll leave you some that I think are understood quite universally.

Stop: Raise your open hand with the palm facing forward, like a traffic signal.

Enemy: Close your fist at shoulder height.

Crouch: Move your open hand with the palm facing down in a way.

Regroup: Raise your arm and make circles in the air with your index finger.

Direction of advance: Point with your index and middle fingers extended towards the place where you should look or advance.

However, if due to lack of radio the use of visual signals is necessary, obviously the best advice I can give is, pay attention at all times to your teammates and let them know your position too. If you need to give them information and they're not paying attention you'll have to make some noise that gets their attention minimally so that the enemy doesn't find out.