Battlefield top tip: If you spawn on a squadmates spawn beacon and it's hidden or in a great flanking spot; do not immediately start shooting and drawing attention to yourself. Get away from it first before you start shooting. This lessen the likelyhood of the other team spotting and destroying it.
Again, one of these these things that you would think would be common sense.
If you spawn on a spawn beacon and there isn't an immediate reason to start shooting (which is someones shooting at you, not you seeing someone), get away from it first. If possible try getting out of the building first and in a better spot away, before you start shooting.
This lessens the likelyhood of the spawn beacon being detected and destroyed. This way you and your team can keep spawning there and keep on pushing from the flank.
Obviously this goes for spawn beacons that are hidden or behind the opposite team.