Traveling is getting back to normal little by little after the Covid-19 pandemic. But travel restrictions continue in many countries, actually, there are very few countries that have no restrictions.
So to be sure you can travel to the destination you chose it is a good idea to check first if you are complying with the regulations and restrictions of that destination.
There are several pages with information about the travel restrictions.
IATA Travel Regulations Map
One that has all you need what you need to travel is the International Air Travel Association (IATA) page.
Go directly to the Covid-19 Travel Regulations Map by IATA
Re-Open EU
Another great and very useful page is the European Union´s webpage, this resource is very useful if you need to travel to Europe, or if you live in Europe, what you need to travel to another country in the EU.
U.S. Department of State- Travel.State.Gov. Covid-19 Country Specific Information
This page of the US Department of State has very good information for US nationals that are traveling abroad. It gives not only the information of the requirements of the destination but also what you need to get back to the US.
U.S. Department of State - Covid-19 Country Specific Information
I think these three pages have almost all the information you will need to know to secure you can travel to your destination.