If you just save your /home partition you'll have all your data and most config files that your apps use. However you'll loose all your installed apps.
There isn't any perfect solution to move apps from your old system to the new one. But I'll explain the best one based on this question:
Create a file called
installed_packages with your manually installed apps:
comm -23 <(apt-mark showmanual | sort -u) <(gzip -dc /var/log/installer/initial-status.gz | sed -n 's/^Package: //p' | sort -u) > installed_packages
Then copy that file to the new installation, open terminal on the same directory and execute:
sudo apt install -y $(cat installed_packages)
You can also edit
installed_packages and add or delete any package you want. You may get some errors like
package not found. That's because you didn't add the ppa you've used for that app.
Now you have 2 options:
The best one is to install that package from any other method that doesn't require a ppa (snap, flaptak, appimage...).
The other option is to save all the files inside
/etc/apt/sources.list.d/ and add the necessary entries on the new system.