How to upload your logo
By default, WordPress will display your site’s title as a logo, let’s see how you can replace it with your awesome image logo.
Upload Your Logo in Customizer
First, navigate to Appearance→Customize. Then click on the Site Identity (1)
Then click on the Select Logo (2) button and select or upload your Logo.
Select your media like you would normally do (3) and click on Select (4)
You can also upload an Alternative logo (8) for the cases you want it to appear over the content, when the header is set to Transparent.
After clicking on select a new window will appear that will allow you to Crop your logo or not. Use the selection tool (5) to crop it and then click Crop (6) or click on Skip Cropping to avoid this section.
Then click on Publish (7) and you are done!