Where do I buy mods Destiny 2?

Excuse me, I'm looking for some information about purchasing mods for Destiny 2. I've been enjoying the game a lot, and I'm interested in enhancing my gameplay experience. Could you please tell me where I can find and purchase these mods? Are they available directly through the game's store, or do I need to look for them on third-party websites? Also, are there any risks or precautions I should be aware of when purchasing mods for Destiny 2? Thank you in advance for your help.