(1) If you are going to use RaspberryPi OS (previously called Raspbian), download the image from here:
Raspberry Pi OS (Lite), Direct Download Link:
https://downloads.raspberrypi.org/raspios_lite_armhf_latest
Raspberry PI OS Download Page:
https://www.raspberrypi.org/downloads/raspberry-pi-os/
(2) With Raspberry Pi OS, you will need to enable WiFi and SSH after burning the image, and while the microSD card is still plugged into the card reader of Desktop / Laptop.
Raspbian Image - Howto Enable & Configure WiFi Before First Boot
For Beginners - How-to SSH to RPi - Setup Putty in Window