Hashcat
This tool is used to decrypt hashes and has too many variants, check hashcat to know how hash works and which hash is.
Identify Hash
To know how to decrypt the hash we have to identify how is compose, usually it can be salt + hash or hash + salt. Page info: Hashcat examples
Basic Hash
Decrypt basic MD5 hash:
First create a file with the hash.
CLI: echo "f4a3546c86b0c40da07c60038c4bab46" > hash
Use hashcat with type 0 (MD5) and dictionary (-a 0)
CLI: hashcat -a 0 -m 0 hash /usr/share/wordlists/rockyou.txt --show
Prompt in terminal: f4a3546c86b0c40da07c60038c4bab46:This hash is MD5