Youtube Commenting ! Need Tips !

I heard that youtube commenting is good for advertising !
Can you share tips how can I do so ?
I mean what should I type in comments ? Domain[dot]Com ?
How many comments can I do per account and should I wait between comments and change them a bit ?
Tips pls Tips ?

Comment twice on a single account and on your attempt at commenting a third video within 10 minutes, a captcha will appear.

It's best to have multiple accounts ready and switch through them if you're using a bot.

And when commenting a domain you can use:

Domain[DoT]CoM
Domain , com
www , domain , com
w w w . domain [Dot] com

Basically try to be creative and you'll get past their url filters.

Lets say I want to do manual advertising and I have around 10 provies and 10 accounts ?
Can I do 100 comments per account/proxy each day ?
I can fill captchas !