In a previous incarnation as a travel writer, I proferred various sorts of advice to travelers. I pontificated on everything from where to visit and what to eat, but I rarely offered instruction to time travelers. The very clever video below from history YouTuber Premodernist provides sage advice to the modern folks preparing to travel back in time to medieval Europe — beginning with the declaration that “you will very likely get sick.”
NB: If the video doen’t open in your browser please click here.
Travel Between The Pages 
Instead of “you will very likely get sick” he could have advised “get properly vaccinated, drink only beer or wine, and avoid the local medical providers”.