jQuery v1.12.4 is reported as vulnerable in online tools when I check my website. Does that mean that my Joomla site is vulnerable?
You do need to setup the Migrate plugin if you are running jQuery prior to the 1.9 version.
A Content Delivery Network or CDN is a globally distributed network of highly optimized servers deployed in multiple data centers. It serves end-users closest to those centers therefore delivering content with high availability and high performance.
$ as a function or variable name, just as jQuery does. In jQuery's case,
$ is just an alias for
jQuery, so all functionality is available without using
$ and can be replaced with