Deleting social media accounts: A guide

https://www.nytimes.com/2018/10/10/technology/personaltech/how-to-delete-facebook-instagram-account.html

HOWTO: Request personal data from Apple

Detailed steps on how to do the request:
https://9to5mac.com/2018/10/17/request-your-personal-data-from-apple/

Quoting:
"After first making the feature available in the European Union to comply with GDPR, Apple users in the US, Canada, and more can now download a copy of their personal information stored by the company. Follow along for how to request your personal data from Apple."

How to delete Google activity records

http://www.wired.co.uk/article/google-history-search-tracking-data-how-to-delete

Who is doing self-driving cars and how do they work

With sensors, actuators and... Software of course.
Interesting article on the state of the art and how do they work:
https://www.theguardian.com/technology/2016/may/26/self-driving-cars-whos-building-them-and-how-do-they-work

Using Audacity to backup non-digital sources

Audacity is a freeware recording software. It can be used for converting your tapes to digital. here's how:
http://manual.audacityteam.org/o/man/record.html
http://manual.audacityteam.org/o/quick_help.html