Build a minimal typography only WordPress theme -- 2

Edit Understrap WordPress child theme theme for a blog, this work includes, CSS and theme elements edits

Parent theme: https://understrap.com/
Parent theme Demo: https://demos.understrap.com/
Maintain minimal override of the parent theme, No extra plugins to be used.

Expected Performance :
1) GT Metrics Grade A, Performance & Structure 100%
2) Largest Contentful Paint : below 500ms
3) Total Blocking Time: 0ms
4) Cumulative Layout Shift: 0ms
Note these metrics are already met by the understrap theme, only need to maintain the same.
Note:
1) All hashtags mentioned in UI are WordPress tags and all the items in navbar, sidebar and below search boxes are categories.
2) ignore multiple fonts in theme, there will be only one single font, Logo and its slogan will be a single image
3) Make use of existing widgets, and no extra plugin to be used.
4) Only 4 colors, Primary font color, basic element color (Orange), Border color and page background color.
5) Image area mentioned should be HTML widgets.

Prototype
https://xd.adobe.com/view/44c3a0be-28a7-4b66-821a-89e499c849ee-1190/