It depends on the kind of environment you expose yourself too.
Used a public transport /visited a public place= change n wash
Went for a walk to a park/ to the store downstairs = wash hands
At all times kindly wear an N95 Mask properly, remove it properly and keep it away. If incase you feel you have been exposed to someone having symptoms then wash/change.
A very important tool to prevent covid infection is - listerene or Chlorhex Mouthwash after coming back.
As a corona warrior i like to believe correct mask etiquettes and a mouth wash has kept me protected, hopefully it helps you too.
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Dont worry too much about understanding guidelines or keeping updated. If you have any questions you can always consult.