Four of us will be traveling to Germany, France (Strasbourg only), Austria, Slovenia and Italy in May and June. We are all fully vaccinated including booster. Where is the best place to find what we will need to do Covid wise in each country?
The airlines follow the IATA summaries: https://www.iatatravelcentre.com/world.php
Reopen EU also allows you to check current requirements, including transits: https://reopen.europa.eu/en
Each country’s embassy website will tell you their requirements. Don’t be surprised if they change prior to (and possibly during) your trip.
You need to look for each country's official government webpage with the information on Covid restrictions for entry.
All of the countries I have looked for provide the pages in English in addition to their native / official language(s).
The best one stop website is Sherpa. Start there. You post which country you are coming from and which you are going to. Then you can double check official site.
Here is a link to the Sherpa site:
https://apply.joinsherpa.com/map