I will be shining light on an useful table of common usability metrics in a chapter of Measuring the User Experience: Collecting, Analyzing, and Presenting Usability Metrics, by Bill Albert (Author), Tom Tullis (Author).
Rotating my head 90 degrees to read this table isn't the best experience. Nonetheless, it offers great value. I'll skip straight to the heart of this chapter: what to consider when deciding the most important usability metrics?
The key factors include the goals of your study and your targeted users' goals, the type of software or resources available for you to use and collect data, your budget and timeline for the study. Great.
Next, take note of these two aspects for your users' experience: performance and satisfaction. Performance essentially means what the user does. To measure performance, you can use metrics such as task success rate, time required to complete task, amount of effort required to achieve desired outcome. Satisfaction, conversely, is to find out what the users think and how they feel about the experience of interacting with your product. To measure satisfaction, metrics could be measuring the net promoter score and their satisfaction level.
Again, this is a brief summary of this chapter in the book which, if you're interested in reading, delves into the nitty gritty details of carrying out such measures via quantitative means.
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