How to determinate good backlinks?

Good and bad links differ from DA, DR, Referring domains, TF, and CF of the blogs. Also, high Spam Score blogs are bad links

If you analyze the backlinks if they have lost in rankings and traffic from the past few months then don't get links from them that also consider as low-quality links

You just need good websites for your links. Age and trust matter. The best way to get quality links is to contact site's owner and negotiate a deal.
Yes it's not the fastest way for link building but this method is very effective and you will not need a lot of suck links.
Good luck!

Good backlinks are essential for a website's success and should have a high DA (Domain Authority), traffic, and ref domains. However, there are many other factors that you need to consider when selecting good backlinks, including the quality of the link, the anchor text used in the linking URL, and whether or not it is reciprocal.
When choosing between good and bad backlinks, it is essential to remember that an unqualified link will not necessarily harm your ranking but may instead lead to lower pageviews or longer loading times on your site. Conversely, links from sites with adverse SEO history can damage your rankings and cause lost business. Verifying the link before accepting it as a submission is also essential.

Good backlinks are those that come from reputable, high-quality websites that are relevant to your own website's content. To determine if a backlink is good quality, look for signs such as a high domain authority, good content, and a natural link profile.