HTML a tag https://www.w3schools.com/tags/tag_a.asp HTML br tag https://www.w3schools.com/tags/tag_br.asp CSS background Property https://www.w3schools.com/cssref/css3_pr_background.asp CSS border Property https://www.w3schools.com/cssref/pr_border.asp JavaScript Date Object https://www.w3schools.com/jsref/jsref_obj_date.asp JavaScript Array Object https://www.w3schools.com/jsref/jsref_obj_array.asp