What command creates a secret with the key "my-password" and the value "53cr3t" at path...

The vault kv put command writes the data to the given path in the K/V secrets engine. The command requires the mount path of the K/V secrets engine, the secret path, and the key-value pair to store. The mount path can be specified with the -mount flag or as part of the secret path. The key-value pair can be given as an argument or read from a file or stdin. The correct syntax for the command is:

vault kv put -mount=secret my-secrets/my-password 53cr3t

or

vault kv put secret/my-secrets my-password=53cr3t

The other options are incorrect because they use the deprecated vault kv write command, or they have the wrong order or format of the arguments. References: https://developer.hashicorp.com/vault/docs/commands/kv/put 3, https://developer.hashicorp.com/vault/docs/commands/kv 4