Setting up mods for gaming tips

Hey, so I am trying to install some mods for skyrim and I need some help.

My current set up:

Motherboard- MSI B850 GAMING PRO WIFI6E ATX AM5 Motherboard

CPU -AMD Ryzen 5 9600X 3.9 GHz 6-Core Processor

Memory - Silicon Power XPOWER Pulse Gaming 32 GB (2 x 16 GB) DDR5-6000 CL36 Memory

Storage - Silicon Power UD90 1 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive

Power Supply - SAMA GT 850 W 80+ Gold Certified Fully Modular ATX Power Supply

My question: Every tutorial i see, the are putting their mods on a separate E: drive. Would it be more beneficial to partition the drive i already have, or to buy a separate Storage? And if it is to buy a separate storage, should I get another m.2, HDD, or SATA? some places say a second m.2 will slow everything down, others say it a myth, and then everyone can't agree. I'm still new so I'm trying to learn what everything means and I'm just confused