How to get backlinks from Competitor websites?

First, search for the competitive links and then register and start building links.

With the help of the different backlink analysis tool available over the internet, you can get the backlink data of your competitor.

You can use the tool Buzz bundle and can easily analyze the Backlinks of your Competitors.

This tool is a set of 5 tools-

Link Assistant
Spyglass
Website auditor
Buzzbundle
Rank tracker.
Hope this helps you.

There are various tools available in the online market as free as well as paid. You need to choose it wisely according to your business niche. One of the best tools which I prefer is SEMrush.