OSTechNix published a step by step guide about installing openSUSE Leap 15.3.
Install openSUSE Leap 15.3 Desktop - A Step By Step Guide
This guide explains how to download the latest openSUSE version and how to install openSUSE Leap 15.3 desktop edition with screenshots.
Install openSUSE Leap 15.3 Desktop - A Step By Step Guide - OSTechNix