Watchfulness is the key and covering off anything they could ingest (the one thing that might have no medical solution) or make major scars with. We had some cupboard and table corner things that went on the more pointy corners and some things that went over door tops to prevent them shutting and pinching fingers. The last item was probably the most valuable.
Upstairs utility cupboard (used to be an airing cupboard but now has hoover and cleaning products in) got a sliding bolt right at the top.
Bathroom door locks (sliding bolt type) are up above grown up eyeline so kids can’t lock themselves in.
All medicines and vitamins are above their reach. Similar in the shed and workshop all chemicals were high up as were sharp or pointy tools.
Cupboard catches on most of the kitchen lower cupboards because of breakables and cleaning stuff / dishwasher tabs etc .
Beyond that I would just day that no matter what you do the little darlings will find a way to injure themselves involving furniture. For both ours it was getting up on the sofa then crawling or climbing over the arm and tumbling onto the floor. I caught the pair of them just in time more times than I can remember but it hasn’t prevented a couple of loud thuds over the years.