You don’t need to buy paid templates or something for short codes!
@Mohammad from MBT has created this shortcodes and you can look that on MBT’s Blog
and He has explained that how it works!
Now Lets come to your main Question.
There are 4 main Structural parts of blogger template
Coding Part :-
it all starts with
<head> </head> part comes where we put the CSS and Some Scripts also we can put scripts after the part and betn the head and body in (Some cases)
And after all the HTML part Comes where
part is where you have to put all the HTML Codings and than finally a blogger Template is created!
And for Css you have to write it all on your own
Please Hit the button if it helped you or if I am wrong somewhere or I didn’t answer exactly to your question or this is not the answer you are expecting than please lemme Know by replying