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I've found the barebones tutorials pretty outdated and I'm hoping for guides(not tutorials) on how to make an extremely simple OS, not a kernel with barely any explanation...
If you want to do extremly simple OS I recommend to you to try write OS with drivers for text mode and keyboard. How to start to do it, depends on your actual knowledge.
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Also, how do you write without the textmode buffer, and do some graphics..
Writing driver for every graphic card is work for ten human lifes. Fortunately, there are standards, supported by every computer how to switch to graphic mode and how to use it. For legacy boot it is VBE.