I have been participating in Fantasy Football for the past 10 years and have had a multitude of success in winning championships in various leagues. Each of these leagues has consisted of friends, family, and select "expert" leagues.
While my response will be a selected opinion of my own, I will always site various sources to support my advise to you. With each question, it is best to provide as much detail as you possibly can so I can provide a more thorough response. Specifically, all players involved in each scenario, the type of fantasy league (e.g. 10 team PPR), the type of scoring system, and particular details related to each league.