Dictionary password cracking

Jo_ann77

I came across a fellow on the net that claims that there are techniques (quantum computers speeds and such) that can crack many passwords, but one thing he mentioned was that any password that contained dictionary words can be cracked. There was however a difference between online pw's and offline pw's in the speed to be cracked.
His # 1 advice was to never use dictionary pw's.
Can anybody relate to this.
As it's not so much if this is correct about how many pw's a code contains, but if it has dictionary words ..

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[Deleted User]

@Jo_ann77 What matters is the amount of randomness or entropy. If you build a passphrase based on dictionary words then that reduces the amount of randomness. So a passphrase needs to be longer than a random password to achieve the same strength.
As a rough guide, if you normally use a 16-20 character password built of random letters, numbers and symbols. A passprhase of dictionary words would need to be 32-40 characters to be equally strong. However, it will likely be more memorable.