The best site for up-to-date comet viewing information is Seichi Yosida’s comet site here:

The screen shot below is the most recent (Nov 15) from that site and shows comets above magnitude 11 or so that are currently in the sky. More details (including finder charts) about the brightest are provided below.

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Comet C/2017 O1 (ASAS-SN)
ASAS-SN represents the initials for an automated sky survey (ASAS) hunting for supernovae (SN) in both hemispheres, with instruments based at Haleakala in Hawaii and Cerro Tololo in Chile. Though the survey targets supernovae, it does on occasion pick up other interesting astronomical phenomena as well. This is the first comet discovery for the ASAS-SN team, as they join the ranks of PanSTARRS, LINEAR and other prolific robotic comet hunters. [Read more at the link above]

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Finder chart for the comet in October and November is shown below.

C-2017 O1 ASASSN

Sky & Telescope has more information about this comet here: Comet ASAS-SN

and Universe Today has some information here:
Comet 2017 O1 ASAS-SN

New Comet discovered by PanSTARRS waaaaaayyy out there beyond Saturn!

A brand new comet has been spotted by the Hubble Space Telescope, and remarkably, even though it is still far enough away from the Sun that its water ice would be as hard as rock, it is already showing signs of activity.
That makes this new comet, called C/2017 K2 (PANSTARRS), or just K2 for short, the farthest active comet astronomers have ever seen - at a distance of 2.4 billion kilometres from the Sun, which is beyond the orbit of Saturn.
Discovered in May in 2017, using Hawaii's Panoramic Survey Telescope and Rapid Response System (Pan-STARRS), astronomers used the Hubble Space Telescope to get a better look at "K2".
Hubble revealed that the comet's coma - the gassy, dusty "atmosphere" that surrounds the comet's solid nucleus - was already around 115,000 km across. That's roughly the diameter of the planet Saturn! Closest approach to the Sun is predicted for 2022.

Read more about it here:
Comet K2 (PanSTARRS)


Our Next Great Comet is OVERDUE!

Tim Reyes writes for One of his recent excellent articles is called
"When is Our Next Great Comet?" An interesting read! [Maybe it will be Comet C/2017 K2 PanSTARRS , see above].