hello, should i keep the content of my website changing in order to get good Rank at google? if yes, how often shouldi update my content? Thanks for your help.
Search engines love change, if the change is in the context of your page, than updating it will make them happy, and by making search engines happy, you get a better ranking (SERPS and PR).
My dear friend It's all depend on you how frequent you can update your content ? Say foreg. if you update your content monthly then google will crawl your site eveymonth + sometimes in between that period, if you do weekly then it will crawl weekly if you update you content every hour (similar to news site) then google will crawl it evey hour. So its all based on your updation. Finally it will help you to gain very high PR. Cool Mate and enjoy your day