The Git tutorials at https://www.atlassian.com/git/tutorials/learn-git-with-bitbucket-cloud are practically unreadable due to the excessively narrow column width. A large number of code sample boxes (with console commands) require horizontal scrolling to see the entire code.
The git subtree tutorial is particularly bad. Every code box except for one requires horizonal scrolling.
Folks reading these tutorials are likely to be doing so on a computer, not their phones.