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One important thing in
programming is to make

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your code easy to read
and easy to understand.

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It shouldn't take long
for someone else to

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get what your code is
about and what it does.

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So in addition to make
your code as clean as

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possible, you can add
what we call comments

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in order to add some notes to
your code so you can explain some

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parts or simply tell what you're
going to do next in your program.

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To create a comment,
this is very easy. You just

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use the hashtag sign and
then whatever is after this

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is going to be a comment.
So this is a comment and

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as you can see here in
the IDE, this is going to

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be in gray. If I run the program, so
stop and rerun, if I run the program,

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you can see here the
line "This is a comment"

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is not executed. So for
example, you could add a

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comment here to say
username, let's say "Ask

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the username" and then
another comment which is.

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"Ask the user age" and then
let's say "Print username and age".

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If you want, you can
also add a comment at the

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end of the line. So whenever
you start a comment,

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whatever after this is
going to be a comment

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but before is going to
be a valid instruction.

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You can also, if you
want, comment a line. If I

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comment "This", it means
simply that this is not

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going to be executed. So I can just run the
program, what is your name, how old are you

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and then you can see
we don't have the print. We

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don't have "Hello username"
because I have commented

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this line. So when you
comment a line, it's not

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going to be executed.
That can be very useful

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when you want to test
some code. You can comment

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a line to test without
this instruction and then

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uncomment to test with
your instruction. So to

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recap on comments, first
of course make your code

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as clean and as easy to
read as possible and then

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you can add comments to
make it easier to understand

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what a certain part of
your code does or maybe

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add some warnings for
any other developers who

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would like to modify
this code in the future or

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well just anything you want if it
can make the code easier to read.