Backlinks are links into your site from other sites, there are lots of theories on how many you need and what is classed as a 'good' and 'bad' backlink.
The importnat part is makign sure the content on the page (and site) linking to your page is relevant, ie getting a site that sells kids clothing to your link to your ski apparel site would be better than a dog food site.
Also keep an eye on what text they use in the link text.
using 'click here' is an obvious mistake, but the words used need to be relevant to both the page they are on and the page they are linking to.
My dog loves
meaty chunky dog food for breakfast
is better than
My dog loves meaty chunky
dog food for breakfast
and both are better than
My dog loves meaty chunky dog food for breakfast -
click here
There are hundres of tips and tricks, I am sure people will post some here, John has written a greta article here
http://www.v7n.com/forums/seo-forum/...o-v7n-way.html
goodluck and keep posting, the boards are a great way to learn and help others