Metadata Removal
Metadata consists of pieces of information that characterize data. Metadata is useful for manipulating and classifying a pool of data, but can reveal sensitive pieces of information that one may not want to reveal. Bits of information such as the manufacturer and model of phone used to take a photo all the way down to GPS coordinates can be embedded in files as metadata. Cleaning files of this information before sharing them is absolutely crucial which is why I have made this list - to enable you to scrub as much metadata as possible from your files before you share them.

While this list is not by any means comprehensive, these tools should help you stay safe if you use them properly. I have ranked them from easiest (top) to hardest (bottom) to use. Carefully read the documentation for each tool beforehand. Each tool is free and open source software.

~ Scrambled Exif
An open-source Android Application which helps you remove metadata from pictures. PrivSecGoys have a nice post about it.
https://t.me/PrivSecGoy/427
https://f-droid.org/packages/com.jarsilio.android.scrambledeggsif/

~ mat2
mat2 is a nice and simple program that you can use to scrub metadata from a variety of documents. You can find it in most Linux package repositories, and Tails includes it by default.
https://0xacab.org/jvoisin/mat2

~ pdfparanoia
A nice program for removing watermarks from pdfs.
https://github.com/kanzure/pdfparanoia

~ pdf-redact-tools
Helps with securely redacting and stripping metadata from documents before publishing.
https://github.com/firstlookmedia/pdf-redact-tools

~ Exiftool
Exiftool is one of the most advanced programs for reading, writing and editing meta information. It is arguably the most comprehensive exif editor available today. Can be used to do anything from simply scrubbing metadata all the way to planting fake metadata as disinformation.
https://exiftool.org/