Q1 - the keys' bindings to work more widely

[Tatsu Takamaro]

Hi there, sirs!

I'm new to Emacs, just a month from the beginning. I've managed to do 
all the major settings, wrote through the Tutorial. But for now there 
are 4 residual questions. I'll ask them one by one, one per letter to 
get more precise.

So, here is the first one. I would like to have my keys (my bindings) 
working more widely so that I could trust them more. But for now some of 
them don't work. E. g. in a Help buffer C-c doesn't work as a copy 
action (though it works globally as I set). And this is not surprising. 
I understand that major modes have priority over the global one. What is 
the best idea to make my keys more reliable? One way is to change all 
the major and minor modes, but it's a big load of work and code. Another 
way is to create my own minor mode key bindings and make it be turned on 
by default, and I managed to find how it should be done ("init-value" 
and "global" should be non-nil, in the "define-minor-mode" call). So I 
hope I'm somewhere close to the solution. Here is my function call with 
an example of C-c rebinding:

(define-minor-mode ttkeys-mode "My key bindings"
:init-value 1 :lighter " TT" :global 1
:keymap
'(
("C-c" . #'kill-ring-save)
("C-a" . #'mark-whole-buffer)
)
)

The TT mode is being shown normally, I can switch in on and off, but the 
C-c and C-a don't work as I told them to. I tried to vary signs like # 
and ', but no result. What am I doing wrong?

And, maybe there is some other advice that you could give to make my 
keys more reliable (make them work everywhere in Emacs)? Don't offer a 
CUA mode, I know about it, but it doesn't meet my needs.

Tony.