Ubuntu

• Try to get comfortable with using the command line. Most utilities have graphical interfaces, but the terminal is still important.

• If you have workflows from Windows or Mac, try to adapt them to Linux. Sometimes you'll have to find alternative applications or change your approach entirely.

• Experiment with different desktop environments. If GNOME (default for Ubuntu) is too alien, try KDE Plasma, XFCE, or Cinnamon. You can install multiple desktop environments and choose which one is launched on the login screen.

• Set up system backups using Timeshift, and don't be afraid to break the system.

• Ignore the people who criticise your chosen distro. Giving Ubuntu a chance is way better than not trying at all.

Use virtual desktops/workspaces, and go between them with super + arrow, or ctrl + alt + arrow.

If you are using a flavor of Ubuntu like with KDE, XFCE, MATE or LXDE, you can even go in the settings and stack workplaces in 2 dimensions.

Install tlp for better battery performance.

sudo apt install tlp tlp-rdw

I feel like the cool features I think of are generally Linux features

• You can periodically have scripts run by setting up from jobs(e.g. make a temp folder that deleted it's contents every 24hours or update the programs on your computer at midnight everyday)
• Ricing your desktop, I've never done it but there's an insane amount of customization you can put into how your computer looks. Just look at unixporn(it's just nerds showing off their desktops) to get an idea
• Getting used to using your package manager, it's extremely nice to not have to open up a browser to download software but to have one place to look every time you want to find software (try using the apt search command)

Picking Ubuntu was a really good choice for testing out how it'd feel to use a Linux distro. That isnt to say there aren't things that the average user wouldn't like when using it. If you need to use office software, there is Libre office suite, but it's just not as widely used or feature full as the Microsoft suite. Or if you're trying to sync files across devices, I swear every linux user has a different means of doing so (one place to start would be Syncthing).

I hope you have a great experience and that you learn a lot from it.