When to use does and doesn't?

Good day, fellow cryptocurrency enthusiasts! I'm curious, can anyone help me understand the proper usage of "does" and "doesn't" in a sentence? I often find myself confused when trying to construct a grammatically correct sentence. For instance, when discussing the potential risks associated with investing in digital currencies, how would one properly use "does" and "doesn't" to convey their thoughts? Any tips or tricks you could share would be greatly appreciated!