Write an article in fluent Swedish about Mobile first-strategi. The article should be written naturally, be engaging and easy to read. Only use H2 and, if needed, H3 headers in the article. The headers should have the correct html tag. Include a list in the article if possible without affecting the quality of the article. You are writing for my website seogruppen.se’s marketing terms page. The purpose of this article is to be informative. For conclusion, don’t use the word ”Slutsats” or ”konklusjon” – Use ”Sammanfattning” or ”Sammanfattningsvis”.