Only download from trusted sites like Nexus Mods (https://www.nexusmods.com/), CurseForge (https://www.curseforge.com/), or the Steam Workshop to avoid malware.

Minecraft has the largest library of "hardcore" survival mods.

Survival Mode Improved - SKSE at Skyrim Special Edition Nexus

Many survival mods change core game mechanics and may require you to start a new save file.

Managing thirst, body temperature (hyperthermia/hypothermia), and fatigue.

Primitive tool-making, slower building processes, and more complex recipes.