Let's Find Out About Bad Backlinks
Google only wants to count natural(good) links that weren't created by your involvement.If your links are paid, they are seen by Google as Badlinks(un-natural).
If you see the message, 'Un-natural links to your site, beware - these are the ones that Google has found and doesnât like.This results in Google labelling your site untrusted. If this happens the traffic to your website WILL be affected.
To Find Out If You Have Any Penalties By Google
Log in to Google Search Console (formerly Webmaster Tools)
1/ Click on All Messages in the menu on the left
2/ Or Click on Search Traffic, then click on Manual Actions.
3/ Here you will see either no messages, or if you do see messages, click on them to read them and attend to them.
In order to find out who is building links to your website, you can use this tool which simple, easy and comes highly recommended - MonitorBacklinks.com.
Now that we Know What Bad Backlinks Are, let's Find Out What Spam Is.
studying it now.
will look into this too.