1. You want to make sure that your backlink is a followed backlink. Right clicking on the link and then clicking "inspect element" in the html code, it shouldn't say "nofollow".
2. One of my favorite SEO tools is www.ahrefs.com - they have a free version you can use. The more backlinks that the site has that's linking to you, then the higher quality those backlinks are. You can also tell if the website that's linking to you is trusted and has organic SEO by looking at the countries that are linking to it. If 20% of the websites backlinks are coming from Russia or some 3rd world country it's probably safe to assume that the quality of that website is fairly poor.
ahrefs also gives you a quality score for domain authority and page rank.
My personal website is www.HippiesHope.com (feel free to look it up in ahrefs), if you have any more questions about SEO feel free to send me a message or schedule a call.