Benefits of taking towers:
Builds gold & xp lead for your team
Increases Map control. Map control makes the map more dangerous for your enemies (easier to gank) and gives your team safer access to xp & gold (Steal jungle monsters and secure buffs)
Take any enemy tower within the first 5 min of the game
Take all enemy 1st tier towers within the first 10 min of the game
Practice achieving these objectives and see how they affect your games
Can you feel the difference in map control?
Do you have a gold & xp lead more often?
Do your games end quicker or slower?