'Do' and 'does' are the two forms from the existing indefinite tense with the verb 'to perform.' Which a person you'll use will mainly rely on the sentence's subject. Their use is nearly equivalent, except for 1 occasion where you can use 'do' instead of 'does.' Infographic explaining the https://financefeeds.com/avatrade-founder-to-exit-as-barinboim-nears-500m-takeover/