How do I run PnL?

Hello there, I'm curious about running a Profit and Loss (PnL) analysis in the world of cryptocurrency and finance. Could you please elaborate on the steps I need to take to effectively execute a PnL? Is there any specific software or tools that you recommend for this purpose? Also, are there any common pitfalls or mistakes that I should avoid when running a PnL analysis? I'm looking to get a clear understanding of the process and how to make the most out of it. Thank you in advance for your guidance.