There is a range of great websites. For startup who go through VC funding etc you might want to look at:
Product Hunt – The best new products in tech.
r/startups - reddit for startups
r/Entrepreneur - entrepreneur reddit
For smaller, independent businesses:
Indie Hackers: Work Together to Build Profitable Online Businesses
Twitter search for indie hackers. Twitter provides a great space to discuss startups and ideas.
For single, independent makers with their projects.
wip.chat: example profile