Four things you never do. Not once, not carefully, not for a second
Never touch the sensor. Not with a finger, not with a cloth, not with a shirt, not with canned air. On a mirrorless body the sensor sits right behind the mount with nothing in front of it, and one fingerprint is a repair, not a cleaning. If you see dust on it, put the cap on and tell a gear lead. You do not fix it.
Never leave a sensor open. Lens off means body cap on, immediately, before you do anything else. Swapping lenses is a ten second job: camera pointed down, new lens in your other hand and ready, off and on in one motion. Never in wind, never in a dusty gym floor, never in rain.
Never touch the glass. Front or back of any lens. Oil from one fingertip etches into the coating over weeks and cannot be cleaned off later. Caps on both ends whenever the lens is not on a body. If it is dirty: blower first, then a real lens cloth, never a sleeve.
Never take gear without checking it out. Every body, every lens, every card, every time, in #yb-equipment. A camera that is not checked out is a camera nobody is responsible for, and the one time it goes missing, that is the whole conversation.