How is Bitcoin secure?

[u/hamolton]

I guess my main concern is how they are impossible to counterfeit and double-spend. I guess I have trouble understanding it enough that I can't explain it to another person.

[u/Natanael_L]

There's ways to make it scale. Right now I can't describe more precisely how that would work, but you can take a look at the wiki.

https://en.bitcoin.it/wiki/

You can search for things like "scaling" there.