The outcome you are targeting with your competitive research plays a role in the efficacy of your research method. So have the outcome in mind before you start, that way you will already be on the path to success!
Competitive positioning - There are plenty of tools around like Klue, that scrape the web and sources data and information about your competitors. But you will need to add color and context based on your specific differentiation. You may also want to do some primary research on your competitors here too, look around their website, documentation, and you may even want to sign up for a demo.
GTM Strategy - Diving into win/loss data related to competitors is a great way to understand the gaps you need to message around or the opportunities you need to exploit.