Before your baby can move independently (roughly the first 6 months), the priority list is short: safe sleep space, socket covers in easily reachable rooms, and securing anything genuinely dangerous like cleaning chemicals.
Once crawling starts, priorities shift fast: stair gates, securing furniture that could tip if pulled (a real and often underestimated risk), and getting small choking-hazard items off low surfaces.
Once walking and climbing starts, add: cupboard locks for anything hazardous, door slam guards if fingers are a risk in your home’s doors, and a fresh look at anything within new, higher reach.
Doing this in stages, rather than trying to babyproof the entire house in one weekend before birth, is both more realistic and lets you focus money and effort on what matters at each actual stage.