I hope my english skills would be enough to answer you )

You should read some articles about this. If say shorty- In poker, pot odds are the ratio of the current size of the pot to the cost of a contemplated call. Pot odds are often compared to the probability of winning a hand with a future card in order to estimate the call's

expected value.

You play 1/2$ NLH 3 guys limp (2$ each), 3 guys fold, your turn. There is 3$(blinds)+6$(limps)=9$ in the pot

you must call 2$ to get chance win 9$

its 2 : 9 = 1 : 4,5 = ~18% pot odds

If you raise to 9$ instead of calling - you got 9 : 9 = 1 : 1 = 50% pot odds

Upper we dont count potential pot odds, but if you raise and know exactly that aggressive player after you will call - you can add his call to pot in mind, and got 9:18 - 1:2 instead of 9:9, but ofc you cant know exactly what your opponent will do.

Then you should count your hand odds and compare with bank odds. But all what i said upper is only pre-base lvl of counting odds. You should read some literature to get full understanding of this questions.