Wearing gloves is always a good idea when using anything from secateurs and shears to a mower, but at the very least you must take your time and not rush.
Never cut what you can’t see, and don’t put both hands into a hedge to prune. In many cases it’s not the hand holding the tool that gets hurt, it’s the other one! I’ve seen far too many shortened fingers over the years!
It seems obvious, but of course you need to be aware of lawnmower blades – make sure the engine is off or unplugged before going near them.
Lastly, always protect cuts and scrapes with a plaster or protective gloves. Keeping a wound clean is absolutely essential when rooting around in soil. You can pick up some nasty pathogens if you’re not careful, including tetanus.