Gradescope can grade bubble sheet assignments automatically, based on the answer key you provided. When grading other types of assignments, there are a few tips that may be helpful to you:
Grading a simple question
Grading even faster with keyboard shortcuts
Advanced grading options
Annotations and advanced navigation
AI-assisted grading.
After you are done grading, and when you are at the Review Grades step,
Click on “Publish Grades” and then click on “Post Grades to Canvas”
Note: There are other reports you can see in this “Review Grade” step. This video shows you the details on downloading and publishing grades. You can also review assignment statistics.