reflict to these videois in 300-400 words https://www.youtube.com/watch?v=HtZJ0QadVIshttps://www.youtube.com/watch?v=agyHN0DXHwghttps://www.youtube.com/watch?v=mFd_ptVWzKQhttps://www.youtube.com/watch?v=waIhxJsccZ8https://www.youtube.com/watch?v=KPawXZ06rJ8