- You can create button like this:
Larger button
<a href="http://google.com" class="btn btn-danger btn-lg" role="button">Reservation</a>
Smaller button
<a href="http://google.com" class="btn btn-danger" role="button">Reservation</a>
Add it right below your phone number.
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Yes, you can use any image size since slider can be used in other places than just home page, so slider might be added in widgets and there is no need for huge images. Upscaling images via code is not how they things are done and you will have to recreate your images or otherwise they will look distorted when upscaling via code. I don’t think you want that.
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It is made for use on mobile as this theme is built mobile-first. Here you can read more about it and “fix” it if you want.
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Don’t use dropdown-header shortcode as it suppose to do completely different thing. In your case you need to follow basic menu setup and don’t over complicate things where it is not necessary.