it should be ctrl-z - is that what ya doing ???

hehe... sorry... cant help ya with question 5. Maybe somebody else can. Hope you have seen that I edited my former post (look up)...

BTW... welcome to simply maya and nice start for the hand !

1. It depends on which modelling type you prefer and what youre modelling.

2. & 3. Goto window > setting/preferences > hotkeys. Here you can see the hotkeys assigned and set your own hotkeys. Also...

:D

Nope... Dont think so...

Select both curves.... goto "edit curves" and "cut curve".

Curves a cut where they intersect.

BTW... its a good idea to rebuild curve after inserting a knot i think... Otherwise you can get some odd behaevior.

Yes... goto curve point mode. Click/drag the extra point you want to add. Then select "edit curve" and "insert knot".

Select curve. Goto "edit curve" and "add points tool". This will and an extra point at the end of the curve. (You can pointsnap this to another curve by using "v"-button).

no problem buddy...