How to build your first website:
1. Have the correct tools!
As with anything having the right tools is essential, because you wouldn't dig a hole with a spoon would you?
for HTML and CSS (and even PHP and JS when you advance) I would recommned Brackets.io by adobe its free and it is very useful
When you first open brackets you will be greated by this screen:
Then go to the top left click File > New then a file called untitled will apear under a heading of working files
go ahead and rename it to index.html
(At this stage i would recommend that you save this file to a folder called "Website" in your documents or on your desktop this will allow you to save faster as you can press Ctrl + S to save at anytime)
so lets begin...
to make the document register as a html you need the following tags:
then if you have chrome you can press 
this symbol which is located in the top right for a live preview of your work that updates live as you are coding.
I would recommend placing your windows like this as it makes the process easier.
(
)
[This shows how the live update works]
anyway so you have the basis of your webpage now add some content...
add whatever content you want if you need help with tags please check out this Link
Now to CSS
CSS uses statments rather than tags such as;
background-color
on brackets click File > New rename it to style.css and save it into your "Website" folder
then go to your index.html page and insert this just under the html tag
link rel="stylesheet" type="text/css" href="style.css"
(with the arrows around i cant post them on here, see image below)
like this:
then go to style.css and start editing
(you can find all CSS statments here LINK)
if your chrome does not edit when you type the color click the chrome windows and press Ctrl +F5 and if that doesnt work close the window and click the lightning again
i could tell you all the css statments but that would take months
so have fun, explore and learn
thankyou for taking the time to read this please upvote and follow me it is really aprecieated!