Functions and Graphs
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I am not sure what the situation is in other countries, but atleast in India, it seems that the standard math syllabus until class 10 or even 12 is insufficient for developing a good intuition for functions and their graphs, or graphs and their functions. So, this post is an attempt to collect resources to help develop that intuition.
First up is a video lecture series by Aaron Schkoler: https://www.youtube.com/playlist?list=PL57pneHQXdPYtFmmxeRWN9WPZyc9oc2q8
Second up is a slightly advanced (but still basic) booklet by University of Sydney's Mathematics Learning Center: https://www.sydney.edu.au/content/dam/students/documents/mathematics-learning-centre/functions-and-graphs.pdf. This contains exercises and also solutions. Be sure to do the exercises - math is like cycling, you cannot just learn math by listening and reading if you do not do it yourself.
You can also augment the above resources with a graphing app like Grapher. Use it frequently, play with it, engage with it.