Add these 2 extensions to your browser:
uBlock Origin Lite uBlock Origin
Go to the extensions icon, then click on uBlock Origin. Click on the settings icon, and turn on every filter. Do the same for uBlock Origin Lite.
This is to block ads (from Spotify, YouTube, etc.), protect from malware, remove annoyances like cookie pop-ups, and provide a cleaner, more streamlined web-browsing experience.
Both extensions and filter lists are open-source, which means you can see their actual code.
Android
go to xManager's release page and download the APK file there. Install it, open xManager, and sign in.
iOS
iOS sideloading is complicated, and there are lots of paid and free ways to sideload. here's what tweaked iOS spotify client I would recommend, and here is a sideloading guide.
Desktop
Windows: download and run this powershell file.
macOS and Linux: run this in a terminal: bash <(curl -sSL https://spotx-official.github.io/run.sh)
Browser: Follow my ad-blocking guide