Newbie Seeking Advice on Transitioning from Windows to Linux

I am thinking about switching from Windows to Linux to streamline my workflow with HoudiniFX. After much deliberation and consulting with peers in my field, I've decided to give PopOS a try. However, to ensure a smooth transition without compromising my productivity, I'm planning to start by dual-booting with Windows. Before I take the leap, I have a few questions and would greatly appreciate your insights:

  1. Dual Booting Concerns: Is dual-booting a good idea for maintaining performance on both operating systems? Will one OS affect the performance of the other?
  2. Data Safety: I have a significant amount of data (around 1.5 TB) that I can't afford to lose. Since I can't currently invest in an external backup drive, how risky is it to potentially lose my data or even the Windows OS if something goes wrong during the transition?
  3. Backup Options for Windows: My Windows OS may not be genuine, and I'm unsure how to back it up properly. Any suggestions for a novice like me to ensure I have a backup in case things go south?
  4. Guidance for New Linux Users: I'll be researching the installation process and requirements for dual-booting, but I'd love to hear your do's and don'ts or any tips you have for a newcomer to Linux. What are some essential things I should know before making the switch?

I'm eager to hear your advice and experiences as I make this transition. Thanks in advance for your help!