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Buying links are helpful if you are buying very high PR link. Otherwise you can get backlink upto PR 3 without buying.

We exchange link to get backlinks and backlinks help us to rank on google search. they are the imporant basics of SEO.

Link building tools are not good for SEO. I don't think they will help in long run though they show some success immediately

Link exchange is one of the basics of SEO. Exchanging links with high quality or high PR sites give you high quality backlink and with these high quality backlinks you will get better chances to get...

There are some SEO practices which you can do your own. try them first if won't find success then go for the professional help. And if you are hiring any professional make sure he/she will not use...

No, It does not.
All the things that matters from your hosting side is the site loading speeding and the availability of server online session. It should not go down.

I've been a victim of hacking twice. I own wordpress blog. Anyone tell me how to make my blog secure with security plugins

It brings Traffic and money.
And i think Money i the thing for which most of the peoples make website.

Keyword stuffing is to add the keyword many times in a post with a little change.
Keyword stuffing is harmful after the emergence of Panda

I think the poor content and copyright issues

Google Ban is very much destructive than google penalty. google penalize the website in search engine ranking. The rank is decreased.

With meta data you mean meta tag and meta discription ?? don't understand your question

Start copyying SEO expert. and do ask them if they are loyal in telling you.