LinuxQuestions.org - Any simple tutorial for xmodmap or xkeycap?

I am a bit lost in the man pages.

Essentially, I want to make the left ctrl key "}" and the key besides it "{".
And similar things for other brackets.

The output of xkeycap had this for the left ctrl key:

Code:

! The "Ctrl" key generates Multi_key, NoSymbol, and Multi_key

Is there a simple tutorial which explains in plain englush what the different entries mean?

eg

Code:

keycode 0x30 =  masculine      ordfeminine    masculine      ordfeminine    dead_circumflex dead_caron      dead_circumflex

What do the 7 entries for keycode 0x30 denote?
How do I find which entry to modify for left ctrl key?

What do the following mean?

Code:

keycode 0x6D =  Multi_key      NoSymbol        Multi_key

keycode 0x64 =  Henkan_Mode    NoSymbol        Henkan_Mode

keycode 0x68 =  KP_Enter        NoSymbol        KP_Enter

keycode 0x66 =  Muhenkan        NoSymbol        Muhenkan

keycode 0x5A =  KP_Insert      KP_0            KP_Insert      KP_0

keycode 0x5B =  KP_Delete      KP_Decimal      KP_Delete      KP_Decimal



clear Shift

clear Lock

clear Control

clear Mod1

clear Mod2

clear Mod3

clear Mod4

clear Mod5



add    Shift  = Shift_L Shift_R

add    Lock    = Caps_Lock

add    Control = Control_L Control_R Multi_key

add    Mod1    = Alt_L 0x00CD

add    Mod2    = Num_Lock

add    Mod4    = Super_L Super_R 0x00CE 0x00CF

add    Mod5    = ISO_Level3_Shift Mode_switch