madamklasa
Hi,
First of all, if you want to custom CSS, you can create a new css file in this directory: /templates/ja_simpli/css/custom.css
1- To increase font size for submenu, you can use this custom css:
.navbar .nav .nav-child {
font-size: 16px;
}
2- Yes, that's correct section
3- I think you can define it via custom.css file as I suggested above because in this template, headings are different in different section of template, you can use Inspect Element in browser to see.
4- I'm not entirely sure of your question here, kindly share more details.
Regards