I have followed a tutorial and it does not work

There are many tutorials related to OS development out there. While there exist a few that are good in quality, we only get to see the poor ones. In fact it always boils down to these problems:

• The author wasn't aware of best practices, or worse, willfully ignored it, which also happens.
• We can't edit tutorials that are not part of the wiki, so we can't fix the issue.

The end result is that practically all foreign tutorials have at least one nagging issue, and quite often, several. With people recreating tutorials at an increasing rate, there's no chance we can discover them all, and eventually suffer their backlash.

The solution is simple: They were wrong, you can't trust them, so stop bothering with them and use the Bare Bones instead.

Otherwise, learn how to do things yourself. It is always good to be independent. Don't follow tutorials because you won't understand much about what programming you have done. It is recommended to just learn a language like Assembly.