Ok thank you for the answer, so this leads to relative key changes, switching into minor/major key scales in the same song, is it covered here somewhere ?

Also lastly, are the links you sent me (music theory, guitar scales, ...) part of one of the experienced lessons rock-blues-country? Or are they somewhere else? I am quite new to this website, so it might be me, but I can't find a class named music theory, except if I do a research then I find Music theory a brief overview, but is there a page on the website where I could see all the available classes rather than to have to do a search? For the moment, the only place I go for classes is home then beginner lessons or experienced lessons... Again, if it is part of rock-blues or country then it is not a problem since I would at some point through my journey encounter those classes

thank you