tips on choosing the high quality sites?

[fianajio]

Link popularity is mostly based on the quality of sites you are linked to. Google pioneered this criteria for assigning website ranking, and virtually all search engines on the Internet now use it. There are legitimate ways to go about increasing your link popularity, but at the same time, you must be scrupulously careful about which sites you choose to link to，can you tell me some tips on choosing the high quality sites? Thanks.