First, choose your footer layout from Dashboard => Appearance => Customize => Footer => Layout => Column Layouts. You will see many options to choose from:
In my case I will choose 1/4 3/4 layout. Click Save & Publish.
Next, go to Customize => Widgets. And start adding your widgets to your footer area:
In my case I selected 1/4 3/4 layout which means widgets inside the Footer Area #1 will be placed under the 1/4 column, and widgets inside the Footer Area #2 will be added to the 3/4 column. All you need is to click the footer area and add your widgets there. save & publish your changes, that’s all!