All the information you need to help you prepare for travel after 1st January 2021 can be found here.
When you arrive at EU border control after the 1st January 2021, British citizens may have too:
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show a return or onward ticket
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show you have enough money for your stay
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use separate lanes from EU, EEA and Swiss citizens when queueing
You will need to declare cash of £10,000 or more (or the equivalent in another currency) if you take it between the UK and any other country.
There are some restrictions in place, on the ability to transport some food items into Europe from the UK. Find out more here.