About css
I would recommend create an assets folder and drag all your css there, inline style are not recommended, because it can makes your html file to long and hard to edit for other developers.
About media queries
I recommend using logical operators Link to css tricks
About bootstrap
I think you could export only the things you are going to use from the library, for example the grid, because it makes your project heavier c:. Try to pick only the stuff you need
Notes Remeber to add the favicon
Sorry if my english is not proper I hope I can help you
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