Skidding/skipping a fixie with ratio 48/16 I'm a noob.

I have a single speed with 48/16 ratio with flip-flop wheel.

I wanted to try what is a fixie and installed pedal straps.

I tried to lock a rear wheel, but it just pushing my hard and keep spinning. I don't see how I can stop it :(

I guess it may be related to ratio/speed/surface.

What is the minimal advised ratio for a fixie?
Advises are welcomed.
the easiest way to start learning how to lock your legs correctly is to alleviate weight to rear wheel. The less weight on the wheel the easier it will be to skid. Lean forward (BE CAREFUL) and then try to lock your legs, think about where your legs are the strongest and try there.
Many people also do "hop skids" where you hop your rear wheel (lift it off the ground) and lock it while it is in the air, then return it to the ground while it is locked.48/16 isn't a bad ratio (pretty normal). you don't wan to dictate your ratio based on your skidding, you want it to be based off your riding cadence.