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