Holy Thursday is also known as "Maundy Thursday." The word maundy comes from the Latin word mandatum (commandment) which is the first word of the Gospel acclamation:
Mandátum novum do vobis dicit Dóminus, ut diligátis ínvicem, sicut diléxi vos:
"I give you a new commandment: Love one another as I have loved you." (John 13:34)
These are the words spoken by our Lord to His apostles at the Last Supper, after he completed the washing of the feet. We should imitate Christ's humility in the washing of the feet. (by serving others)
Congratulations and welcome!