It doesn't lead ... If there is to be an inflectional ending for person or tense, that ending goes only on the first (or only) verb. All other verb-forms in a verb phrase are either base, third (past paticiple) or -ing forms.
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divyanshSo, if I am using "doesn't leads" then is it completely incorrect?It is completely incorrect. Only the plain form (lead) can be used after forms of do (do, does, did, don't, doesn't, didn't).
divyanshSo, if I am using "doesn't leads" then is it completely incorrect?Yes, it is 100% incorrect. This a point of grammar where there is no latitude.