Combine the dynamic content of widgets with the static content of pages and posts. When you create widget ares in the content of pages and posts you are able to drop widgets in the content area, which makes all widget’s functionality available there.
Creating widget areas by using plugins is very easy. It requires no coding knowledge at all. There are many plugins that you can use. Some of them are free, some of them paid.
This one here is pretty advanced. It supports adding widget areas to pages/post, replacing sidebars, controls widgets visibility. It is pretty powerful and reliable solution. Check it out.
Here is a free plugin.
Most of the plugins will create widget areas for you. Other plugins will provide you with shortcodes that you can place in a page or post. Then you can go go your widgets section (Appearance -> Widgets), find the widget areas created by the plugin and start dragging widgets in.
If you are an advanced user you can code custom widget areas yourself.