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TYPO3 offers the possibility to use the Application Context to distinguish between Development, Testing and Production. Here's how to use:

There are several different quotation marks, here you will learn how to use them in HTML.

If you often need to set page IDs in plugins, here's how to enable page IDs in pagetree.

Oops, I can't do anything with the error... but what to do?
Don't panic - it's not that bad! There is a simple method to get rid of the error message like: "Oops, an error occurred! Code: 2017042520255025e4885c" to debug.