I wanna get better at CS (top lane)

Basically, title, my weakest point in League of Legends is...farming, there are 2 problems I have: 1) If I'm facing against a HARD lane matchup I'm losing out on CS unless I'm a lane bully like Renekton, Teemo, Gnar or Gangplank who can zone out an area 2)If I am stomping my lane matchup, I find it hard to farm under their tower. My top lane pool (starting from most played to least played) is Teemo, Mundo, Renekton, Gnar, Gangplank, Wukong, Singed, Sion, Garen PS: Does anyone have any Gangplank tips?{{sticker:garen-swing}}
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