One thing that hos not been said yet.

With thin CA, the joint must be "mechanically" tight. Squeeze the copmponents to be joined together, and THEN add a drop of Thin CA to the joint. Do not put the CA on forst.

For Medium CA, it is a 50/50 whether you make a "gappy" join and add the CA, or whether you lay a bead of CA on the one component to be joined, then "mate" the other piece.

By way of example, to "sheet" a wing, you add sheets of balsa to the ribs, by first putting a bead of medium (maybe thick) CA on the ribs, and then placing the sheeting over the glue.
For a tight joint, like the "sticks" in the fuselage, or framing members of the rudder/fin/stab/elevator, make a tight joint, then drop a drop of thin CA on to the joint.
For joints like the large parts of the fuselage (top to sides, for example), it is commong to squeeeze them together, and glue them with thin CA where they touch, and go back afterward with medium CA where the parts have a slight gap.

gus