White hat SEO For competitive keywords

I want to know if some one wants to optimize a website for very competitive keywords like travel, finance and ...
1) Can he use of blackhat seo techniques?
2) Will he become successful only by using white hat seo?

Personally I never use black hat techniques, especially for serious business.

So with that in mind I would use white hat stuff, first for long tail keywords and then for the very competitive keywords

Using the long tail keywords can be great, especially if the main terms are so competitive which may already be dominated by some older companies having thousands of backlinks. It is possible to build profitable websites via white hat SEO methods and links are going to be among the essential factors.

The problem with "blackhat" techniques is going to be that, by the time you hear of them, so has Google. Use them and you risk being banned from Google.

White hat is no tricks, just solid HTML, CSS, JS, SQL.
Black hat is serving tricks, traps, dealing from bottom of the deck, taking lessons from politicians and lawyers. Usually means exactly what Mark_A said above: serving one page to search engines and something completely different to users, usually by sniffing out IP ranges or User Agents. What "wealth" one can make black hat is very limited, once the SE's figure it out, site is banned. White hat, on the other hand, gets a fairly decent chance at making long term wealth.

The last post was thoghtful. If you use black hat techniques, you have to be ready to change operations from a banned site to a new site regularly. That would not work for many businesses!

White hat SEO methods are reasonable and will not be punished the way, only time president of a number of.

White hat SEO techniques are beneficial for site visitors as well as for search engines. The best method to get good traffic to your site, but it is very time consuming method.Black hat SEO is the use of techniques that are unacceptable to search engines to boost a page's position in search results. this is no benefit to site visitors. That can lead  sites penalized by search engines.

Technically if you say you never do something you shouldn't have to follow it up with an "especially for". ;)

Dave Davies, CEO
Beanstalk SEO

Well, I thinks its better to go with white hat SEO rather than adopting the black hat techniques. With white hat SEO it may take time to get at a better position in terms of Ranking and SERP's but its legal way and the safe one where black hat SEO may give you instant results but there are more chance that your site may be banned for ever which is some thing you don't want...So, my suggestion is to go with white hat SEO.

Steer clear of black hat SEO methods and those that use them. Not reputable SEO companies to use for your campaigns. Only use white-hat, or approved, methods.

Well use only white hat techinques as they are riskfree.... There are lot of things which you can do legally and yet get your desired results!