I bought a Raspberry Pi 4 Model B kit from thepihut.com (which has 4GB of memory, a case, a power lead, an HDMI cable and a 16GB SD card)
Then I bought an HDMI to VGA cable because my monitor only had a VGA input.
Finally I bought an HDMI to HDMI coupler because the two HDMI ‘ends’ I had were both male!