알겠습니다. 사람들이 제 비밀번호를 모르게 할게요.
I got it. I won't let people know my passwords.
> I got it. I won't let people know my passwords.

비밀번호를 얼마나 자주 바꿔요?
How often do you change your passwords?
> How often do you change your passwords?

아마 일년에 한번 쯤이요?
Maybe, once a year?
> Once a year, maybe?

자주 바꾸면, 새 비밀번호를 잘 잊어버리니까요.
If I change them often, I would forget my new passwords.
> If I change them often, I easily forget my new passwords.

비밀번호 관리자를 쓰면 되죠.
You can use password manager.
> You can use a password manager.

그러면 비밀번호를 잊어버릴 걱정은 할 필요가 없거든요.
Then, you don't need to worry about forget passwords. 
> Then, you don't need to worry about forgetting your passwords.

비밀번호를 길게 설정하면 안전한거 맞죠?
If I made long passwords, it'll be safe right?
> As long as I make passwords long, they will be safe, right?

어렵고 독특하게 만들어 봐요.
You should try to make passwords difficult and unique.
> Try to make them strong and unique.