What does it means when something is random?

I think Random is when you are choose or pick something with think about it when for example playing a board game when you are rolling a dice. it is random

what is the difference between "and" and "or"?

The difference between "and" and "or" is "and" is both thing has to happen at same time  and "or" either one of the two.

what does the word "if" mean how do we use it in english ?

what the word if mean i don't know.
You use if in a sentence to state something that you are hopping to happen or supposing to do.
For example "if i was rich" or "if he is late he will get fired"