How to Add Sidebar for a Page

Add default Sidebar

Step 1: Go to Appearance >> Customize

Step 2: Find Sidebars

You can change General Setting, Single Sidebar Layouts, Dual Sidebar Layouts here and choose Sidebar for default Pages, Search Page, Front Latest Posts Page, Blog Posts, Blog Archive, Portfolio Posts, Portfolio Archive, Single Product, Product Archive.

Add Sidebar for particular page

Step 1: After creating a page, come to Page Options

Step 2: Find Sidebar

Choose Sidebar and position you want to use and Hit Publish.