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There are many displays for Raspberry Pi and following some of the manufacturers instructions isn't always so easy.
But there are scripts available which will make it very simple.
As an example, in this post, I will install the LCD touch display from Joy-IT RB-TFT3.2-V2. The size is 3,2" with a resolution of 320 x 240, has a touch display and comes with 3 buttons.