change html using jquery

1$("#regTitle").html("Hello World");

1$(element).html("Hello World");

1$("button").click(function(){
2  $("p").html("Hello <b>world</b>!");
3});

1var itemtoReplaceContentOf = $('#regTitle');
2itemtoReplaceContentOf.html('');
3newcontent.appendTo(itemtoReplaceContentOf);

1//Takes input from entire page and uses it to change the HTML of h1
2$(document).keypress(function(event){
3  $("h1").text(event.key);
4});
5