Welcome to the forums, @Ra_Ju.
Have you seen this Matt Cutts video? It’s from a few years back, but it’s all still valid.
The best strategy of all, of course, is to create a quality site with great content that other sites will choose to link to.
If you look around the Marketing section here, you’ll find other threads on a similar theme, such as this current one: What is backlinks and how to get it quality? You may find other ideas there, but be sure to read the whole thread; not all the suggestions will be “Google safe”.