If you are going to take a course (audit or paid), you should do best effort in it and take it once, unless you fail. If you know you're not doing it right, than don't audit. If you do it right, than no need to take it for credit--you mastered it, previously when auditing.
Auditing or sitting in on a class takes a lot of the pressure off and saves you time, because you don't have to take tests and you don't receive a grade. Often, you will have less work than for-credit students, but you will also be able to learn and engage with the material.
If you audit a class, you take it for no credit, and do not have to do the assignments or take tests. You still attend the class, learn from lectures, and have access to textbooks, the instructor and learning materials. You will also be asked to pay for the course as if you were taking it for credit.
To audit a class, you must usually get permission from the instructor. Students can audit classes online for free through MOOC providers like edX and Coursera.
i think there is nothing stop you from doing that but maybe some employers they will ask for a certificate otherwise you can list the course you audited and all the skills you gain from this courses you can list it in your resume just be aware you will not be able in audited courses to submit assignments and quizzes.
Auditing a course means that you receive no academic credit for it, and you are not responsible for tests or homework.
Course audit is given only to a student who has passed the comprehensive examination and still. within the residency requirement of five (5) years for Master's and seven (7) years for Doctorate. programs. A student who wishes to audit a course must state his/her intent/reason to do so at.
Auditors are used to ensure that organizations are maintaining accurate and honest financial records and statements. The Treasurer and Auditor must work together in order to balance their finances.