I want to ask about applying for a job. Do employers really check all the information on your resume is valid? Like past jobs, school etc... I was thinking applying for a job at a coffee shop or something.

Yes, most employers will check the information provided on a resume, from calling previous employers, doing background checkss, and checking your education as well as any credentials if listed.

Yes that's why it is considered very important employers do not only check what is written on the resume but they also check how it is written. Employers judge yourself from your resume, so it should represent what you really are and what want to be in future. So, one should be very careful while making a resume.