Why Good Content is Needed

With regards to search engine optimisation, a lot is said regarding the importance of links, keywords and title tags. None of these should be ignored when building a website - keyword research should be carried out thoroughly, the title tags unique and optimised for each page, and link building pursued in whichever way you see best fit. But none of this should be carried out at the expense of the actual on-site content.
There's all manner of off-site trickery and quirks that can be employed to increase your natural search engine ranking and drive traffic to your website. If a visitor arrives and finds nothing of any relevant value to what they were searching for, or badly written copy littered with typos and grammatical errors, then they're not going to stick around. If your website is selling a service or product this is commercial suicide.