Getting backlinks is the best way to promote your website in the eyes of the Search engines. Google consider back links as a vote of confidence which result in higher Page rank and Authority. Make sure you only post to the relevant backlinks.Gov backlinks are the best way to increase page authority.It is recommended that you don’t spam and just 4 to 5 backlinks are enough to get ranking.The only thing which matter in the Search engine is relevancy. Never post backlinks which are not relevant to your niche.
Following are some of the Gov Sites form where you can get do follow backlinks.