Position the blade guard as low as possible to limit your exposure to the blade.
Keep hands away from the blade at all times.
Hold the material to the side of the blade so that your hands cannot fall into the blade if you trip.
Always keep your eye on the blade.
Limit the number of people around you, to avoid distractions and accidental trips.
For beginners, have a second person to give you feedback (e.g. point out when you are positioning your hand too close to the blade).
Maintenance
disconnect from power
remove front cover (two screws)
tighten tensioner to free the blade
raise the blade guard
remove positioning blocks if required
remove/replace blade
ensure that blade teeth are in the correct position (facing forward and down)
loosen tensioner slowly, manually turning the blade to check that everything is in position, then hand tighten followed by 1/4 turn tightening with 6 mm hex key
install the positioning blocks (should be almost touching)
adjust bearing so that flat face almost touches back of blade
replace cover
Tips
Lowest speed should be fine for most tasks (higher speed makes more heat)
Different blades for different tasks (shallow “scroll” blade for fine work, general blade for wood, bimetal blade for aluminium).
Cutting some steel might be okay, but this saw is really designed for woodworking
Position the blade guard as low as possible to keep the blade from flexing too much
Curves can't always be cut in one go (cut wider to make space for the blade, then refine afterwards)