[noah330]

I agree with Albee. It's a good idea to leave the A insert empty.

If you decide to swap effect order or to add something like a tape simulator, that may introduce latency when tracking, its nice to have an empty slot instead of having to move everything around.

I tend to insert a channel strip (like SSL) onto each channel (hold down option when selecting the plugin). I'll do this on the second or third slot and that way I have a good starting point as well as some room to expand either way.

Enjoy ProTools!