Help :(

Hello guys
I've been forced to use a Mac for about an year now and I'm still having problems to work with it.

The first one is about a really annoying huge amount of clicks to get focus between windows, this is so stupid and I really cannot get used to it. Is there any way to change this behavior ?
I mean ... I've focus on window A and I want to press a button on window B; If i press on button I expect to have button clicked, instead I've the window B focused and nothing more happens. That's so stupid. Pleas tell me I can change it!!!

Second problem: many applications I code with have some kind of windows I need to stay on screen when I change focus. But sometimes happens those kind of windows disappear as soon as the main application loose focus. I don't know the name of those windows but they have a small and only 1 circle on the top left. This stupid bug is more annoying then the first one. To a programmer is a pain in the a**. Please tell me how to fix it.

Third one (but unfortunately not last): is there any short cut to change windows between same application ? On any Linux os for example if u have a text editor with multiple files open u can switch between files with the good old ALT+TAB. Here we have CMD+TAB but it's working only with apps.
I know there is the F10 key but that involve an annoying animation and the use of mouse; unthinkable!!!

Many thanks for help.
Please help me to (at least) like OSX. So far it's only a pain in the back to work with.

 

Many thanks for all replies.
You've been very helpfull at least for #3

too bad for #1 & #2

 

ofc there's no such thing as the perfect OS ... I guess I'll throw it away as soon as I find a way to develop iPhone/iPad application on another system.

By the way it's not true I don't like mac... it's just stupid sometimes and it's not built for programmers, that's for sure.