Mojave vs. Catalina

Catalina only opens apps that are written in 64bit code, the new OS drops support for 32bit apps,

to check for any 32bit apps you have at the moment run this app, https://www.stclairsoft.com/Go64/

This will produce a list of your 32bit apps, you can then search the developers website to see if

they are providing 64bit updates or alternatives.

Yes, you can upgraded to Catalina.

Only you can answer if you should. For most people the biggest issue is needing to continue to run 32-bit apps. If you do, don't upgrade.

Make sure to back up your Mojave system (as I'm sure you're aware) You can go back to it if you're not ready for Catalina yet.

I was hesitant as well. I'm taking the plunge and doing a clean install of Catalina. I plan to add Mojave to a 2nd volume since I only have one 32 bit app I use regularly. (and it's a video game— and I should probably give it up anyway)

Good luck/Have fun!

Upgrading macOS without fear - Apple Community

It's written for Mojave but the concept is identical.

Catalina does away with iTunes as you know it in Mojave.

Great! Let me know how that procedure works out for you.

Catalina provides very few changes from Mojave and may not be worth it. You will need to decide the tradeoffs.