How to discover new mods to play with.
You can browse available mods via the in-game UI (accessible via the main menu) or the mod.io site:
Use the Filters system to focus what mods are displayed. For example, filter by only the latest Game Version to see only mods compatible with the current version of the game. There is a chance that mods without the latest version tag could still be working, but you'd be trying them at your own risk.
All mods on Thunderstore (https://thunderstore.io/c/core-keeper/) are outdated and will not work on modern Core Keeper versions.