I wanted to know that whether it is possible to sit in a grad-level course or undergrad course without registering? What should I do before going to the class? should I talk to the professor? Is it illegal to participate in a class without registration? I need to learn about some other area that is why I need to participate in other classes as well.
closed as off-topic by Nate Eldredge, Buzz, Massimo Ortolano♦, Scientist, Wrzlprmft♦ Sep 6 '18 at 14:18
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In the US, as far as I'm aware, the term you're looking for is "auditing" a class. You'll need to check your school's policy for this, as they vary.
For example, here's the audit policy for The University of Texas at Austin, which requires filling out a form, getting permission from the professor and there being space available in the class. But, when you're auditing, you only go to lectures, you don't participate in discussions or do any of the actual coursework.
This is pretty similar for other schools I've looked at but, as noted, you'll need to check your specific university's policy for it. Hopefully knowing the term will help.
For huge classes with 100+ students, you may be able to get in the unofficial way but for smaller classes of 10-30, the professor will probably notice that there's someone extra in the class, particularly if there aren't enough seats in the room.
(Per the comments, this might be country-specific. In my experience, this answer applies to the countries where you can take as many or as few courses as you like per semester, for the same price).
Are you a student of the university? If so, you're generally free to sit in, although it's polite to ask the lecturer first (I've never had a lecturer say no, in fact they were very happy, so don't worry). Still, if you're going to sit in, I'd also try to take it formally for credit.
If you're not a student of the university, then it's mandatory to ask. Again however, I've never seen a lecturer say no, and they were even happy to talk to me about the material after class even though I'm not a student.
In both cases, you won't be able to do anything other than sit in for the lectures - so no tutorials, no labs, no homework assignments, and so on.
Many online universities offer free online classes without registration for getting knowledge. You need to attend these classes in your manageable time period.