As a young single woman, I lived in Brooklyn, NY during the late 1970s, 1980s, and early 1990s. Apartment break-ins and car break-ins, parts theft, and theft were a way of life. Chains are completely useless, anyone can kick those in. You need a way to see who’s there prior to opening the door. It can be a peephole or an electronic version but that’s the only safe way to even crack your door other than the following. Any easily accessible door must be solid and without windows. If your door has a window you do not have a door. Get one of those wrought iron security doors and make sure it’s installed properly. Same for windows. If it can be reached, it offers 0% security regardless of locks. There are “fire department approved” gates that allow you to exit in case of a fire but will not let anyone in. Good ones of either of those for either door or windows are not cheap. In approximately 1980, I got one for my fire-escape window and hazy memory recalls it at around $300 back then.
Also, with regard to locks, a deadbolt separate from your entry knob is key (pun intended). I’m not up-to-date anymore but for decades the pick-proof lock of choice for NYers was Medeco. They also were never cheap but I can tell you with certainty that almost any lock you buy in a big-box store is probably useless.
Came back to edit this to add that your “lifestyle” and general awareness suggestions are spot-on. When Facebook started, my bestie who still lives in Brooklyn and is a retired cop would laugh with me about the a$$holes posting. She and I agreed it was like taking out a “please rob me” ad. Also, if there’s any escalating violence or police action, run don’t walk away from the situation. Be aware enough of your surroundings to make that happen. And keep everything about your house and car as plain vanilla as possible. No one with good intentions gives a damn about your stick figure family. If there are shots heard outside your home, DO NOT go to the window to see what’s going on. Hit the floor for heaven’s sake!