There are two ways in which somebody could become immune to COVID-19.

(1) Get vaccinated against it. No vaccine is currently available.

(2) Get infected with it.

Use of antiviral drugs like Remdesivir against COVID-19 is under very active investigation. Results may become available in a month or so.

The general suggestions you mentioned, "keep distance, wash hands [I did this after going shopping this morning], stay out of crowds, hand sanitizers, masks". are all good ones.