Can anyone tell me the use of don't or dosen't??

Used for Do:I ,You ,we ,they Used for Does : He, She ,It

example = I don't eat. he does not eat.

'don't and doesn't' both are used in present indefinite tense. when we make and speak negative sentences in present we use 'don't and doesn't'. Don't used with plural subject and 'doesn't' used with singular subject. Ex -1.) I don't have a pen. 2.) I don't play. 3.) Ram doesn't go for a walk. 4.) Uncle doesn't meet me.