Widgets are small blocks of content, which you can find in theme footer or sidebar. They were originally designed to provide a simple and easy-to-use way of giving design and structure control of the WordPress Theme to the user, which is now available on WordPress Themes to include the header, footer, and elsewhere in the WordPress design and structure. Widgets require no code experience or expertise. They can be added, removed, and rearranged on the WordPress Administration Appearance > Widgets panel.

Just drag and drop the widgets you want, into the right hand side where your sidebars and footer widgets are listed. Simply drag your widgets over to the sidebar or footer column, and then populate the content.
There are various fields and settings you can choose for each individual widget and all are self explanatory. You can also use multiple widgets per footer column, just drag and drop them into place. And you can put as many widgets as you want inside sidebar. Once you have finished populating the widgets, always make sure to hit the Save button to save the settings.

Just drag widget from the left hand side and drop it on the right