how i make my css code, + css help

if youd like help with css (i prefer that youre a mobile usre but using a computer is just as good!) feel free to message me !

and for simple css code --- it doesnt matter what order its in ! i found css layout snippets and just copy n paste them in, then add my own image url !

"how to i get image urls?" i can show you !
look up "free image hosting" or "upload image for url" on google ! i use https://postimages.org/ for image hosting. i rlly recommend !!!
it should guide you through the simple and easy image hosting progress !! after you upload it, copy the "direct image link". paste it in the parentheses !!

example:
.. image url in the parentheses below !!!!!
body{
background-image:url(https://64.media.tumblr.com/68a2699dafeab7d8401f874f85ef2574/tumblr_pwgdd8hVGf1yt0azko1_400.gifv);
}
REMEMBER: do not move the {} symbols from their places !! this will mess up the code.

remember ur free to message me for more help !