How can I check the quality of backlinks to a website optimized for Google search?

Hello, forum. Could you tell me how I can check the quality of external links pointing to my website? Which ones are dofollow and which are nofollow? Which ones are useful, and which ones should I remove?

What services are available for this? Preferably free or low-cost ones.

I’m interested in your experience and best practices.

Thank you for your attention.