I am new to Magento. I got a Magento project which I need to upgrade. To do so I read in some tutorials that there are security patches to be performed before upgrading Magento.
I am curious if those security patches can be done after the upgrade? Since the patches are often available for multiple Magento versions.
You look at the description for the version you intend on upgrading to. It will tell you what patches are included. If you upgrade to the very latest version of Magento, you will have all the security patches included.
This is now standard policy since the "Shoplift Bug" issue for Magento to make sure all security patches get released along side a full install version.
