Expressions and Scripts for AE are really handy and powerful tools. Expressions are used for effects and are pieces of code that you can find online or write yourself that you apply to individual properties on layers in your comp. They are fully editable so you can change the code to suit your needs. Scripts let you do things like adjust easing on keyframes with one click or use to quickly and easily adjust the length and framerate of all the comps in your project to have the same parameters. Scripts are very versatile and you may want to use your search engine of choice to look for "After Effects Scripts" to see the wide variety that are available. Keep in mind, however, that unlike expressions which are just integrated into your project file, scripts need to be placed in the appropriate folder within the Adobe folder hierarchy. I have added a handful of links to the Helpful Links bar on the right side of this page for you to check out.
FYI: expressions are usually free since they are more often than not just little bits of code, but it seems most scripts you have to pay for since there is a lot more work having to be put into them. If you like to write code, AE does let you create your own scripts as well by going to File > Scripts > Open Script Editor.
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