Hashcat comes pre-installed in Kali and Parrot OS. In addition to Hashcat, also download a wordlist like the 10-million-password-list-top-100.txt or rockyou.txt. It contains a list of commonly used passwords and is popular among pen testers. You can find the Rockyou wordlist under /usr/share/wordlists in Kali Linux.

And the mode (-m) for the type of hash.

For example, the hash mode value for SHA1 is 100, and for doing a dictionary attack (-a 0):

$ hashcat -m 100 -a 0 sha1.txt /usr/share/wordlists/rockyou.txt