αφού means after, since. example: Αφού ήπιε καφέ, έφυγε για το σπίτι του. (After he drunk coffee, he left for his home).
μόλις means just after, as soon as. example: Μόλις τον τσίμπησε η μέλισσα, άρχισε να ουρλιάζει. (He started screaming as soon as the bee stung him).
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.