Both don’t and doesn’t are contractions using the verb do and the word not. It's easier to see which one is the correct choice if you expand the contractions: don’t is a contraction of "do not" and doesn't is a contraction of "does not." We know that a verb with a third person singular subject gets an -s or -es on the end in the simple present tense. This is true for all regular verbs. So then, in the contractions with the word not, don't becomes doesn't with a third person singular subject: Doesn't, on the other hand, is used when speaking in the third person singular only ("he," "she," and "it"). Like don't, doesn't is used to make negative statements:

http://www.infoplc.net/files/descargas/siemens/infoplc_net_the_guide_about_tcpip_connections_between_pcs_and_siemens_plcs.pdf I don’t like football (je n’aime pas le foot) = PRESENT SIMPLE, FORME NEGATIVE, A TOUTES LES PERSONNES SAUF 3 E SINGULIER avec « like » I did it, you did it, he/she did it, we did it, you did it, they did it (je l’ai fait, tu l’as fait, il/elle l’a fait, nous l’avons fait, vous l’avez fait, ils l’ont fait) = PASSE de « DO », A TOUTES LES PERSONNES, pour exprimer le : PASSE COMPOSE ou PASSE SIMPLEEn anglais, la réponse ne peut pas être juste « yes » ou « no », mais on utilise « does/doesn’t » en plus :

The big difference in use between don't and doesn't is that don't is also used to give commands (commands in English are always given in the second person singular or plural):Many users have written to us asking whether don't or doesn’t is correct in a particular sentence, or asking what the difference between don't and doesn’t is. Grief’s biggest advantage is it can contend with the top RW’s, but cheaper. Simple as that. it doesn’t have the leech on it, meaning you need it from other sources, but again: cheaper. most players will be able to eventually get Grief, but BotD is going to pretty much be the domain of whales/high end farmers due to Zod. I didn’t do that (je n’ai pas fait cela) : APRES DIDN’T = POUR LA FORME NEGATIVE PASSEE DE « DO » (voir DID-DIDN’T plus bas)