Layouts for Blog Page/Post
1.1 Add Sidebar Layout for Single Post Layout
1.2 Add Sidebar Layout for Single Post
Admin -> Appearance -> Customize -> Widget
Here you can drag n drop the available widgets such as blog category, Recent post, Tag to "Single Posts Sidebar"
2.1 Drag n drop available widget to sidebar blog page
Customize > Blog > Archive
Set left/right sidebar and "Publish"