For CAing most balsa to balsa joints, you only need one drop per square inch contact area.

First, you adjust the fit between parts as well as possible.

With the medium CA, angle the jont to alow the glue space to flow in, apply CA and immediately get the parts back in position.

With thin CA, you hold or clamp parts in exact position, and apply at the crack between parts, allowing the capilary action to draw the glue in.

With thick CA, you apply the droplet of CA to the edge grain part and then stick the end grain part onto it.

**********
For beginning builders especially, I recommend replacing most CA with a yellow glue such as Elmer's Carpenter's Glue. Its easier to work with, more forgiving of errors, easier to clean up and MUCH cheaper. Apply just a bit more volume than when using thick CA, just enough that some gets squished out when you fit the pieces together. Always apply yellow glue to the more open grain part first, to allow better bonding. (opposite of CA...which gets put on the more closed grain part)

Yellow glue is far superior to CA for joining Lite Ply, or for any lamination of doublers. You'll use much less glue and save weight to obtain the same (or better) strength.

****

Any glue will be stronger than the wood you are joning if applied properly... Just some have better properties for different applications.