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TeX is [u]easy[/u]. It takes 2 days to learn and 2 weeks to a become a proficient journeyman...

Of course, you rip the benefice of this for Life...

You gain time, when you use TeX instead of word to type formulas like :

"the integral from 0 to 1 the function (1 divided by 1 plus x squared) of the x variable is equal to pi."

[u] The previous text, in TeX code would look like[/u] :

TeX is $underline{easy}$. It takes $2$ days to learn and $2$ weeks to a become a proficient journeyman...
medskip

Of course, you rip the benefice of this {bf for Life}...
medskip

You gain time, when you use TeX instead of word to type formulas like :
$$
int_0^1{1over1+x^2}dx=pi.
$$
bye

Explanations

$maths$ = math mode between two $ symboles
$$maths$$ = the same but in beatifull formula mode
TeX = a core macro that writes TeX with eyecandy
underline = core macro to underline
medskip = macro to skip a bit vertically and indent
{bf expression} = the expression is written with Bold Face
int = integral symbol
^Someting = overscript something
_something = subscript something
{exp1over exp2} = writes the fraction exp1/exp2
pi = the greek letter pi

There...if you have read that, you know 50% of what you need to know to type in TeX