At the moment, there are four tags that deal with encoding issues: the general encodings (95 questions), the more specific font-encodings (57 questions), and the two package-specific tags fontenc (66 questions) and inputenc (64 questions). The assignment of tags to specific questions seems to be at least partially a matter of chance: encodings questions will usually be about either font or input encoding, and font-encodings questions will sometimes specifically deal with the
I suggest that two tags are enough. Let's make fontenc a synonym of font-encodings. Let's create a new input-encodings tag and make the existing inputenc tag a synonym of it. The questions tagged with encodings should be manually retagged to either font-encodings or input-encodings; some questions will feature both of these tags.