Who won the 2018 national championship college football?
The College Football Playoff selection committee selected four teams to advance to the playoff. The bowl selection show took place on December 2. The top-ranked Alabama Crimson Tide faced the fourth-ranked Oklahoma Sooners in the Orange Bowl and the second-ranked Clemson Tigers faced the third-ranked Notre Dame Fighting Irish in the Cotton Bowl, both held on December 29. Alabama defeated Oklahoma, 45–34, and Clemson defeated Notre Dame, 30–3.
Who won the 2018 National Championship game in College football for the season that took place in 2017?
Alabama Crimson Tide
2019 College Football Playoff National Championship
The College Football Playoff selection committee selected four teams to advance to the playoff. The bowl selection show took place on December 2. The top-ranked Alabama Crimson Tide faced the fourth-ranked Oklahoma Sooners in the Orange Bowl and the second-ranked Clemson Tigers faced the third-ranked Notre Dame Fighting Irish in the Cotton Bowl, both held on December 29. Alabama defeated Oklahoma, 45–34, and Clemson defeated Notre Dame, 30–3.
Who won the National Championship in College football for the season that took place in 2018?
Clemson Tigers
2019 College Football Playoff National Championship
2019 College Football Playoff National Championship
https://en.wikipedia.org/wiki/2019%20College%20Football%20Playoff%20National%20Championship
2018 College Football Playoff National Championship
https://en.wikipedia.org/wiki/2018%20College%20Football%20Playoff%20National%20Championship
The 2018 College Football Playoff National Championship was a college football bowl game that determined a national champion in the NCAA Division I Football Bowl Subdivision for the 2017 season. The Alabama Crimson Tide defeated the Georgia Bulldogs 26–23, coming back from a 13–0 deficit at halftime to secure the win in overtime. 
2018 College Football Playoff National Championship
The 2019 College Football Playoff National Championship was a college football bowl game that determined a national champion in the NCAA Division I Football Bowl Subdivision for the 2018 season. It was played at Levi's Stadium in Santa Clara, California, on January 7, 2019, and was the culminating game of the 2018–19 bowl season.[5] Sponsored by telecommunications company AT&T, the game was officially known as the College Football Playoff National Championship presented by AT&T.[2]

The Clemson Tigers defeated the Alabama Crimson Tide by a score of 44–16 to win the championship with an undefeated 15–0 record.
2019 College Football Playoff National Championship
The 2018 College Football Playoff National Championship was a college football bowl game that determined a national champion in the NCAA Division I Football Bowl Subdivision for the 2017 season. In this championship, the Alabama Crimson Tide defeated the Georgia Bulldogs 26–23, coming back from a 13–0 deficit at halftime to secure the win in overtime. The 2019 College Football Playoff National Championship was a college football bowl game that determined a national champion in the NCAA Division I Football Bowl Subdivision for the 2018 season. In this championship, which was played at Levi's Stadium in Santa Clara, California, on January 7, 2019, the Clemson Tigers defeated the Alabama Crimson Tide by a score of 44–16 to win the championship with an undefeated 15–0 record.