This site is a helpful guide about how to study mathematics and common undergraduate questions Understanding Maths.
For undergraduates - good notes on undergrad mathematics Paul's online math notes .
easy and simple online graph calculator that can be used by high school students Desmos graph calculator.
Knowledege and memorisation is not the same as understanding.
Here's how you can add an image:
Here's how to make a list:
To learn more HTML/CSS, check out these tutorials!