Hello mats.
What are hyperlinks? Are they really helpful to get high rankings?
Can you tell me please How to build hyperlinks to your site?
Thanks a lot in advance.

You want to say "Link Building" right? It is essential part of SEO and without it you can't get desired ranking for competitive keywords.

A hyperlink or a backlink is a link pointing to a website/ webpage from outside the website/ webpage. Backlinks are quite helpful in quick indexing and fetching a good SERP ranking since they work as 'votes of confidence' for the search engines. Hence more the number of quality backlinks improve your chances of showing up in SERPs.

Here's how you can do link building effectively:
-Submitting your website to dofollow social bookmarking sites
-Register and participate in social networking sites
-Guest posting on dofollow niche related blogs
-Post on dofollow forums
-Create link baits

I prefer Keyword Country to design my link building campaign. It helps me to find niche related blogs and forums for backlinking. Pretty helpful!

I agree with Rebecca and follow the link building strategy.

you will get hyperlinks as many as you want. you just need to start link building activity on dofollow and quality sites. SMO also helps you get quick hyperlinks.

You are talking about backlinks because backlinks is also a type of hyperlink which is directly point to our website. Forum posting is the most effective method of making backlinks and through this method we can make plenty of backlinks of our website in one day.