https://www.youtube.com/watch?v=59pex8k8Xr8  TUTORIAL BOOTSTRAP

https://www.youtube.com/watch?v=7ogxqEXNKw8 MENU EN BOOTSTRAP

https://codingpotions.com/desarrollo-web-boostrap GUIA BASICA BOOTSTRAP

http://maximo2014.blogspot.com/2018/12/bootstrap-337.html GUIA INTERMEDIA BOOTSTRAP