Most people don't think (enough) about security when using the internet. One example: non-encrypted emails. Strictly speaking, a non-encrypted email is much more insecure than a postcard that can be read by everybody during delivery.
What will follow here is a list of tips how to securely handle your own data, together with a list of relevant software and its use.
(Planned) Topics (a highly uncomprehensive list):
https://www.epr-21.de/ • https://www.trepr.de/ • https://www.cwepr.de/ • https://www.uvvispy.de/
https://www.eprfit.de/ • https://www.spinpy.de/ • https://www.fitpy.de/
https://www.orgphot.de/ • https://www.cryptochrom.de/