Knowing CPR isn’t a big deal until it is. Take a short class on how to do it right if you ever have the opportunity.
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@rephlex00 similarly, learning how to use a fire blanket or an extinguisher (and when not to) can be very useful and the basics take not much more than an hour.
@rephlex00 absolute basics that I found not obvious btw: grab the blanket so that your hands are shielded from the fire and hold it spread out in front while approaching the fire; if using an extinguisher against a fire in a can/basket/hole walk around it so that fire doesn't hide on the near side. If the fire is larger than ~office wastebasket and no people are in danger, escape and alert the fire brigade instead of extinguishing. If able, keep a reserve of the extinguishing agent in case the fire starts back up.