How to stop my iPhone from connecting to a Wi-Fi?

Other than turn off Wi-Fi, I would like to know how to stop my Wi-Fi from connecting to the internet. I have Wi-Fi at my house but when I got to my room I loose the signal and pick up another signal from across the street and that is a week signal and it slows down my iPhone. I don't want to cut off the Wi-Fi because it is tedious just to turn off and as I frequently go back and forth.

In Settings, go to Wi-Fi, then press the arrow next to the name of the network you want to get rid of. On the screen that appears, press the first button "Forget this network". This will stop your phone from joining in automatically.

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