What does the score actually mean?
It is the share of available weight the page earned. Every check has a weight based on how much its absence costs, passes earn full weight, quick fixes and structural findings earn none, and investigate findings earn half.
It is a summary of observable markup and configuration. It is not a ranking prediction and not a promise about traffic.
Reading The Results
Answer it for your own page
The inspection is free, needs no account, and takes a few seconds. It reports what is actually wrong with a page rather than what is generally true about pages.