Hello Aspirant

Yes, you can take admission in UG course in Delhi University. Also, if you have done your Class 12th from Delhi, then you will also get the benefit of Delhi Quota or else you can anyway get admission without Delhi Quota.

And no, you won't have to attend the college on a regular basis, it depends upon your course and college. In some colleges there are some strict rules regarding getting detained due to short attendance while some are chill. If you succeed in creating a good pier group around you then going to college on a regular basis wouldn't be an issue for you.

Hope this helps.

All the best!