You can customize widgets in Admin -> Appearance -> Widgets. Below are we've suggested widgets for each widget section.
Pre footer is the section above footer, you can use
Subscribe to Newsletter here.
In footer you can use there widgets: Site Information, Custom Menu and Contact Information.
If you don't need to use the Newsletter widgets, you can deactivate it in
Plugins and click to Deactivate button on Newsletter card.
In blog sidebar, you can use Blog Search, Blog Popular Categories, Blog Popular Tags and Blog Posts widgets.