How often i can change my keywords?

My site is indexed yesterday on google and i want to erase all keywords which i was put first time and put new ones.
Can somebody tell me what will happend if i do that? Did google remember my first keywords and if i change with new ones will not give a effect with second ones?
Can my site be penalized by search engines if i change this all my keywords now?

Thanks

 

Your site will be re-indexed at some point. Google will not "remember" your previous content. You will not be penalized for that.

 

Find the keywords you want and add them, there will be no problems

 

Thanks for answers. Then if i put new keywords( i mean i will not add new keywords with old ones, i will erase all first keywords which i was put first time and replace with new ones) google will index my site with new keywords AND I WILL LOST ALL OLD BACKLINKS and indexed pages, and everything go from begining.

Right?

 

Just add your keywords. Don't over think it. Google will now penalize you.

Keywords have nothing to do with backlinks. Also, metatag keyword is just a small factor these days.

 

And how many keywords are allowed in google TOS per site? I was hear somebody say 3, but i see some sites have 10-15 keywords and nothing happend bad .

 

You will not be penalized, but you will lose rank over time, and getting to rank again on your new KW's will be harder because of your irrelevant linking profile and inconsistent content

 

add watever keywords u want 2 add..there wil be no pblm.

 

if you mean the keyword meta-tag, google never read it in the first place
http://googlewebmastercentral.blogspot.com/2009/09/google-does-not-use-keywords-meta-tag.html
if you mean as anchor text in backlinks, there's no penalty, but you are starting from scratch with the new keyword. Your old backlinks still count as backlinks.