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I use Firefox Focus on my mobile devices. It blocks trackers and you can easily delete your history and cookies.

https://support.mozilla.org/en-US/kb/focus

Naa4on Why do many math books have so much detail and so little enlightenment? (2010)

The first time I really grasped the very basic concepts of linear algebra instead of just being able to calculate things like eigenvalues was after watching this series by 3blue1brown:

https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2x...

There is a series on calculus as well. It is honestly beautiful.