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Bind:
bind function allows to assign a cvar to a certain keyboard or mouse button. its syntax:
bind "BUTTON" "CVAR(S) or FUNCTION"

few examples:

bind "N" "net_graph 2"
(- opens a Net-Graph panel with "N"-button)

bind "KP_5" "buy vesthelm; buy defuser"
(- buys "Bulletproof vest/helmet" & "Defuser Kit" with "numpad-5")

bind "TAB" "incrementvar cl_interp 0.01 0.1 0.0025"
(- changes LERP from "0.01" to 0.1" with a step of 0.0025 with "TAB"-button)

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most of buttons for binding are straightforward: "Q", "W", "E", "1", "2", "3", etc,
however the naming of some buttons is not as obvious

NUMPAD
( / ) KP_SLASH
( * ) KP_MULTIPLY
( - ) KP_MINUS
( 7 ) KP_HOME
( 8 ) KP_UPARROW
( 9 ) KP_PGUP
( + ) KP_PLUS
( 4 ) KP_LEFTARROW
( 5 ) KP_5
( 6 ) KP_RIGHTARROW
( 1 ) KP_END
( 2 ) KP_DOWNARROW
( 3 ) KP_PGDN
( Enter ) KP_ENTER
( 0 ) KP_INS
( . ) KP_DEL

SPECIAL
( Insert ) INS
( Home ) HOME
( Page Up ) PGUP
( Delete ) DEL
( End ) END
( Page Down ) PGDN

( Up Arrow ) UPARROW
( Left Arrow ) LEFTARROW
( Down Arrow ) DOWNARROW
( Right Arrow ) RIGHTARROW

MOUSE
( LMB ) MOUSE1
( RMB ) MOUSE2
( wheel-button ) MOUSE3
( wheel down ) MWHEELDOWN
( wheel up ) MWHEELUP
( fourth mouse button ) MOUSE4
( fifth mouse button ) MOUSE5

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Toggle:
toggle function allows to switch between two or more values of a cvar. its syntax:
toggle CVAR STATE#1"STATE#2 STATE#3...

if CVAR has only "0" and "1" values, then you can omit the "States"

few examples:
bind "V" "toggle voice_scale 0 0.25 0.5 0.7"
(- toggles the volume of incoming voice messages from "0%" to "25%" to "50%" to "100%" with "V"-button)

bind "L" "toggle cl_righthand"
(- toggles between "weapon-in-left-arm" and "weapon-in-right-arm" states with "L"-button)

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Incrementvar:
incrementvar function increases value of a cvar from one number to another with a determined step. its syntax: incrementvar CVAR INITIAL_STATE END_STATE STEP

few examples:

bind "TAB" "incrementvar cl_interp 0.01 0.1 0.0025"
(- changes LERP from "0.01" to 0.1" with a step of 0.0025 with "TAB"-button)

bind "INS" "incrementvar net_graph 0 3 1"
(- toggles between various screens of Net-Graph panel with "INSERT"-button)

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Alias:
alias function allows to assign one or more cvar(s) and their values to a certain variable and then call those cvar(s)
by calling that variable. its syntax:

alias ALIAS_NAME "CVAR(S) or ANOTHER_ALIAS"

example:
alias crosshair_red "cl_crosshaircolor_r 255; cl_crosshaircolor_g 0; cl_crosshaircolor_b 0"
alias crosshair_green "cl_crosshaircolor_r 0; cl_crosshaircolor_g 255; cl_crosshaircolor_b 0"
alias crosshair_blue "cl_crosshaircolor_r 0; cl_crosshaircolor_g 0; cl_crosshaircolor_b 255"
bind "J" crosshair_red
bind "K" crosshair_green
bind "L" crosshair_blue
the code above allows you to change the crosshair's color to red, green or blue by pressing "J", "K" & "L"

"alias", at first, seems like a lacking function, but its true power shows up with a switchable-aliases (when you change the content of alias via a different alias), consider the code below:
alias buffer crosshair_red;
alias crosshair_red "cl_crosshaircolor_r 255; cl_crosshaircolor_g 0; cl_crosshaircolor_b 0; alias buffer crosshair_green"
alias crosshair_green "cl_crosshaircolor_r 0; cl_crosshaircolor_g 255; cl_crosshaircolor_b 0; alias buffer crosshair_blue "
alias crosshair_blue "cl_crosshaircolor_r 0; cl_crosshaircolor_g 0; cl_crosshaircolor_b 255; alias buffer crosshair_red"
bind "J" buffer
the code allows you to use one button - "J" to cycle through red, green and blue crosshairs, it works like that:

first we create the alias "buffer" and assign it to alias "crosshair_red"
we press "J"-button and alias "buffer" is called, it in turn calls "crosshair_red"
alias "crosshair_red" makes a crosshair red, but also changes the alias "buffer" - now it is assign to "crosshair_green"
we press "J"-button a second time and alias "buffer" is called, but now it calls "crosshair_green"
alias "crosshair_green" makes a crosshair green, but also changes the alias "buffer" to "crosshair_blue"
we press "J"-button a second time and, as you get it now, alias "crosshair_blue" is called
in the end of that code "crosshair_blue" assigns "buffer" back to "crosshair_red", forming a loop (or cycle)

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Actions:
actions are various action-commands that a player can do it the game.

for example:

forward
back
moveleft
moveright

jump
duck
speed (walk)

use
drop

impulse 100 (flashlight)
impulse 201 (spray)

radio1 radio2 radio3
menuselect 1-9

attack (shoot)
attack2 (weapon's alt mode)
reload
invnext (next item)
invprev (prev item)
lastinv (last used item)
slot1 slot2 slot3 slot4 slot5 slot6 slot7 slot8 slot9 slot10
nightvision

buymenu
buyequip
autobuy
rebuy
buy
buyammo1
buyammo2

showscores
showbriefing
chooseteam

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Wait
glossary: cvars, autoexec, bind, alias, 2

wait
wait is a function that pauses (waits) a certain amount of ticks before executing next cvar. its syntax:
wait TICKS

the tick a certain timespan that relies on your fps, so, say "wait 15" with 100 fps will act different than "wait 15" with 60 fps. in other words you need to test what tick works better on your hardware, so take your time to check your config

wait is useful when you are creating a bind that will affect (or will rely upon) animation's end

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plus and minus (+ -):
plus and minus signs (+ -) are special modifiers that executes a cvar or function
when a certain button is pressed (+) or when it is released (-)

example #1:
alias +slowmo "host_timescale 0.2"
alias -slowmo "host_timescale 1"
bind "Q" +slowmo
the code slowdowns time when the "Q"-button is pressed ("+slowmo") and restores the time to normal when "Q"-button is released ("-slowmo")

example #2:
alias +jumpDuck" +jump; +duck;"
alias -jumpDuck" -jump; -duck;"
bind "ALT" +jumpDuck
the code allows to jump-duck when the "ALT"-button is pressed

PS, we do not use the code below, because character will jump-and-duck non-stop:
bind "ALT" +jump; +duck;