HTML elements can be nested in other elements means element inside an other element
<Tag1><Tag2>Content</Tag2></Tag1>
You can put more than one element inside a single element.
In above example we nested two elements heading1 and bold
Open notepad or any other text editor, follow the following points.
<br />element for next or new line if neccessary
save file with name task.html or task.htm and then open it using any browser and see results.