1. Look up the 10 Essentials and learn what they are/how to use them.
2. Search for Wilderness First Aid (2 day) or Wilderness First Responder (10 day) courses in your area. The focus is on how to assess and treat problems after they've occurred, but in the process you'll learn what the potential dangers are and how to avoid them or notice them early. For example, you can get hypothermia at surprisingly high temperatures (50 degrees F) in the right conditions, and some of the symptoms are paradoxical.
3. This one might be a bit controversial, but look up the Boy Scouts of America requirements for tenderfoot, second class, and first class scout. Before kids can start earning badges, the Boy Scouts require them to learn a fairly rigorous and comprehensive set of skills in order to not die in the process (first aid, camping, starting a fire and camp cooking, navigation, knot tying, swimming, etc., as well as some ideological requirements that you can skip). Some of these, like what to do when you're lost, you can learn from books or YouTube videos targeted to scouts. For others, you'll at least know what you don't know and the right words to look up to find classes. For example, searching for 'map skills' might not find what you're looking for, but there may be an 'orienteering' club in your area.