For leagues, I have used CBS, Yahoo, ESPN and Sleeper. Presently using Sleeper and love it other than the graphics. It allows me to do some things as a commissioner that other free sites do not.
For advice, all of the free ones are about the same.
Fleaflicker offers fast, easy, powerful and free fantasy sports. Enjoy fantasy football with live scoring, stats, dynasty tools, news, rankings and apps.
www.fleaflicker.com
Our league has used this site for our keeper league for 15 years.