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What are travel restrictions when I will go to Lisbon, Portugal? Should I go to quarantine?
Right now, in Portugal there are no quarantine-on-arrival measures in place.
On the UK GOV page for Portugal, it says:
Air - Mainland Portugal
You will be subject to health screening on arrival. Your temperature will be checked and if it is high or you show signs of being unwell, you will be referred to the health authorities.
What about when I come back to Budapest, Hungary?
The US embassy in Hungary states:
General Rule:
Only Hungarian citizens, permanent resident card holders of the European Economic Area (EU member states, Switzerland, and Norway), and other permanent resident card holders who have close Hungarian relatives are able toβ―enter the country, all subject to a 14-day quarantine.
You currently don't fit any of those requirements, therefore you need to apply in Hungarian for an entry permit on the National Police website.