createTextNode(data)

<button>YES!</button>
<button>NO!</button>
<button>WE CAN!</button>

<hr />

<p id="p1">First line of paragraph.</p>

function addTextNode(text) {
  const newText = document.createTextNode(text);
  const p1 = document.getElementById("p1");

  p1.appendChild(newText);
}

document.querySelectorAll("button").forEach((button) => {
  button.addEventListener("click", (event) => {
    addTextNode(`${event.target.textContent} `);
  });
});