Make the move to Google Analytics v4 now to make sure you get a good history of your websites data. In 2023 the old analytics will be going so update your google analytics now.
How to import into WordPress
Photomosaic Plugin does not work with Wordress 5.x!!
Customise your WordPress Login
Responsive WordPress — Google Webmaster’s Mobile Guide – Mobile Friendly
Google has recently started talking about mobile friendly websites and how they will (potentially) penalise websites that are not mobile friendly. This basically means - does your website view properly on mobile devices, phones, tablets, etc. This is generally termed Responsive Web Design or RWD by the trade.