Design your Header in the Elementor Editor. When you finish, clickPublishto save the Header. You will be asked to choose the pages where the Header will appear. For details, seeSet conditions for site part templates. Edit a Header
The easiest way to display different sidebars on different content is Elementor. You do this as follows: First, create several Elementor templates, as explained above. Each template should have its own sidebar. Then, go to conditions and assign each template to the relevant category, page, or...