Please follow to following process to change the color of :-

Header Site title and site description.

Goto admin menu >> appearance >> customizer >> color >> Header Text color.

Link hover color

Goto admin menu >> appearance >> customizer >> color >> Link hover color.

Menu text color.

Goto admin menu >> appearance >> customizer >> color >> Menu text color.

Section title text color

Goto admin menu >> appearance >> customizer >> color >> Section title color.

Category text color of banner and feature display section.

Goto admin menu >> appearance >> customizer >> color >> Banner / feature display category text color

Category of blog post color.

Goto admin menu >> appearance >> customizer >> color >> Blog category text color.

Post title of banner post title and sidebar slider color.

Goto admin menu >> appearance >> customizer >> color >> Banner / sidebar slider post title text color.

Excerpt of banner

Goto admin menu >> appearance >> customizer >> color >> banner excerpt text color.

Excerpt of blog post.

Goto admin menu >> appearance >> customizer >> color >> blog excerpt / author description text color.

Post date and no of comment at blog post

Goto admin menu >> appearance >> customizer >> color >> blog post date & comment text color.

Tag color at blog post.

Goto admin menu >> appearance >> customizer >> color >> blog post tag text color.

Paragraph of post detail or page detail.

Goto admin menu >> appearance >> customizer >> color >> Single post/page paragraph text color.

Block quote at sidebar and inside detail of page / post.

Goto admin menu >> appearance >> customizer >> color >> Blockquote text color.

Widget title

Goto admin menu >> appearance >> customizer >> color >> widget title text color.

Widget detail

Goto admin menu >> appearance >> customizer >> color >> widget list text color