If you have been on SCN before October then you'd pick a primary tag that corresponds to what used to be a "space" on SCN. There is a spreadsheet with the whole tag list somewhere but I've actually bookmarked my own blog because it has a decent collection of reference links (including the one that leads to the said spreadsheet).
As Veselina correctly pointed out, it's not about the tag you want, it's about where you'd get best chance for an answer. E.g. I used to follow ABAP Development space before and now there is a tag with the same name. There was never a space for BAPI, SE37 and such. You can, of course, put those as a personal tag but they have no use so far, from what I've seen. Primary tag needs to be the subject (or product) that the question relates to. If you've hinted at what exactly your question is we could make a more intelligent suggestion.
If the tags were so granular as to have a primary tag for every transaction or subject then the list would be enormous. How would you envision usage of tags if it was a "complete" list? Personally, I feel there are already too many primary tags.
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