I generally use the US CDC sites as a starting place. In the end there are only a couple of real question marks, since once you start traveling widely most of the recommendations remain the same.
Questionable (in my mind): rabies, cholera, Japanese encephalitis, anti-malarial tablets. Beyond question (again, in my estimation): typhoid, Tdap, HPV, the hep A & B, yellow fever, influenza, polio, MMR, chicken pox and/or shingles, pneumonia, now COVID.
This is not an exhaustive list! Do your own research, and pay attention to durations which range from a year to lifetime. It's not difficult, but you can make it so if of a certain mindset--just like outfitting your bike to a certain standard of perfection. Remember that vaccinations not really that expensive in the context of longterm, worldwide travel. And as always, don't rely on internet forums alone for medical advice.
Hope that's helpful.
Mark
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