Hi! Could someone help me? I don't understand Real Numbers, I just need someone to break it down for me so I can understand a bit better. Thanks in advance!

you know about whole numbers, right? 1,2,3,...

you know about integers, right? -3,-2,-1,-,1,2,3,...
you know about fractions, right? -19/3, -4/17, 1/2, 3/5, 19/23, ...
Real numbers include all of these, as well as any other number you are likely to come across or use to solve problems:
π, √2, and so on

youtube has videos discussing the topic in different ways.