Html css

i tried your free HTML CSS lecture and i must say i understood it in a good way. but since i had a background of programming a while back but now i want to resume on that and start a carrer as a full stack developer. and i must appreciate your passion and hardwork that you have shown towards it. so what i found was missing in your lecture is the basic of css and some part of html like in css you have not described about the layout (border, border-radius. and difference between em and rem and px and many more, i hope u understand and doing so i have to switch to goggle in order to search for that particular attributes, which ofcource break the rythem of learning from your base stuff, which is quite annoying (recently i faced it and im watching another html css video from freecodecamp.org but will resume very soon. so donot take it as a bitter comment from my end but what needed is a clear picture of html and css. i hope you would understand my scenario and would comment me back on this. The hardwork and passion towards enhancing others people to learn programming is a great deal of work your showing plz keep it this way and more more people will join you very soon.

Thanks Amit