Plugin and Klaatu (Great name BTW - I wonder how many people know its origin) I think I can answer both of your questions.

There are three types of CA, Thin, Medium and Thick

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Thin CA is used when you have two tight-fitting parts - Like when the end of a rib fits tightly into a notch in the leading or trailing edge stock. The two pieces are joined and aligned, then a drop of thin CA is added to the joint. It will wick into the wood (effectively sealing it) and hold the joint extremely well - and almost instantly.

Thin CA is also the only glue that should ever be used with CA hinges. Personally, I use it for CA hinges and very rarely elsewhere.

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Medium and Thick are basically the same, but Thick CA has a slightly longer setting time, so it gives you a little more time to align parts.

Both of these glues are used in a more conventional manor - add glue to one part, and join it to the second, but unlike regular wood glues, they set very quickly when the parts are pressed together.

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I use Medium CA for 90% of my builds. About the only place I deviate from Medium CA (Aside from Epoxy for high-stress areas and Thin CA for Hinges) is, If I am adding one large surface to another (like adding a doubler to a fuse side) I will squiggle a line of wood glue around the doubler, but I will leave a few bare areas where I can put a drop of Medium CA. Now I can press the pieces together, wait about 20 seconds for the CA to set, and continue building. No need to stop and wait overnight for the glue to dry.

Something else worth mentioning... You can use an excellerator on Med and Thick CA (It shouldn't be used or needed for Thin) but I use these VERY sparingly, and when i do, I don't use the spray bottle, but instead I just dip a piece of wire or small screwdriver into the bottle and drip it exactly where it's needed.