First-build PC for 1440p gaming and video editing on a $1500 budget

[MiaR]

I'm planning my first PC build for a mix of 1440p gaming and video editing, and I've set a budget of around $1500 for the core components. I've done a lot of research, but I'm getting overwhelmed by the choices, especially regarding the motherboard chipset, RAM speed compatibility, and power supply wattage for future upgrades. For experienced builders, what are the most common pitfalls for first-timers that aren't always covered in standard PC build guides? How do you approach part selection to avoid bottlenecks and ensure good airflow in a mid-tower case? Are there any specific tools or testing procedures you follow during assembly to troubleshoot potential issues before powering on the whole system?