@pparks1 That is all good, but LastPass or most other password managers have an online account for you in their system. You supply your userid and master password (the same one used for local access) to get into that site. This is one method of getting into your vault.
Any competent online system will have your password stored in encrypted/hashed format that makes them "virtually" impossible to decrypted. There have been reports of incompetent system, even some large organizations, storing passwords in plain text, but I have never heard of a password manager doing this. I am comfortable with my master password being stored on their system.
Of course, lastpass has an account for me on their system. Let's say my username is
bob@bobross.com. And my password is happylittlebushes^gr3@t. When I setup an account with lastpass.com, I enter in the email that I want to use, and I enter in that password above as my master password. Locally on my computer, the email address, along with the master password are used to generate an authentication hash which is what gets sent to LastPass. So, in my example, my authentication hash might be ( rew8-qr-13refw0a78-32i09r-0fdsa jsakhpiqfhk;jgt42eh98fdsIOd;hf3213#9289redsFui92u4395riadsckdlfjasdfpsdF).
So, a nefarious hacker breaks into the systems at LastPass and they find an account for
bob@bobross.com. Bingo, now let's grab his master password and we will know all of his painting secrets. Well, last pass doesn't store his password, the only thing you are going to find is the following hash , rew8-qr-13refw0a78-32i09r-0fdsa jsakhpiqfhk;jgt42eh98fdsIOd;hf3213#9289redsFui92u4395riadsckdlfjasdfpsdF. That hash isn't going to work at the logon prompt.
The only thing that LastPass is storing is encrypted data. They don't have the encryption keys used to encrypt or decrypt your data. Those are only used locally on your computer.
The bigger threat would be somebody hacking into your laptop and installing a key logger or taking over your webcam to record the keystrokes of your email address and your master password. These are the people who may gain access to your vault.
If you want to test the system, have somebody change your lastpass master password to something you don't know. Then call LastPass and beg and plead with them to change your password on your site so that you can get your data back. If you find somebody who can do it, let us know.