The report might seem overwhelming at first, but there's a few things you can check to get an understanding.
Have a look at the preview, this will show you how your website looks on desktop and mobile. Check that it looks good on the mobile, this is really important for your Google rankings -- Google loves mobile!
Keyword performance, have a look at this to see how you perform against a competitor (if you added one). Are you ranking for the keywords for your top services and products? Are you ranking in the right places if you run a local service?
Have a look at the different ranking opportunities, see if there's areas you can change content or SEO.
Have a look at the onsite actions, see if you can make any of the suggested changes.
Backlinks is this an area you can improve on, all backlinks make a difference in your SEO. Again check your competitors.
If you are still trying to figure out what it all means, speak to us about helping you with your SEO.