This is the screen that welcomed me after installing Lightroom Classic 7.4.
Now I could go on about this, but am going to refer you to websites where people have already done this!
Here we go.
Adobe - well they did the update so there is no better place to start!
Matt Kloskowski - one of my favourite Photoshop and Lightroom instructors.
That should do it to be honest!
Rick McEvoy ABIPP - Photographer, Photography Blogger