I used spreader to put some grass seeds in my back yard. I rake them thoroughly after that. After three days, I was checking my yard and still see bunch of blue grass seed on the ground. Do I need to rake them again.
When you seed with new seed the most important thing is not to walk on it or rake! Fruffed up soil, seed, roll and that should be good enough. Never allow the germinating seed to dry out or be raked. In about 2 weeks you should be good for the first mowing.
After this first mow you should start training your baby grass to grow deeper to get the moisture. Water deeply, allow to dry enough where when you walk on your grass the grass blades stay down. That is the signal to water deeply again. Do not water again until the grass shows this basic stress signal. Keep your lawn no shorter than 3 inches!!! Not 2 1/2 but 3".