Teaching maths is an art. Many teachers turn it into memorising of formulae without explaining the relevance. Those who can make it lucid and fun hold the attention of their students.
Charts are pictorial representations of data. They make it easy to 'see' any underlying patterns in the data. This is particularly useful for stock price charts.
Why? Because the underlying patterns represent the collective greed and fear of market participants.
Studying price charts is called 'Technical Analysis'. But there is nothing 'technical' about it, because there is very little math involved.
Spend a little time in understanding the various price patterns, and what they reveal about investor sentiment. There is no better place to start than John Murphy's introduction to chart patterns.
You can read the eBook at this link. Bookmark the link and return to it periodically.
You won't become an expert overnight. But you will get an idea about what is going on in the market. Why prices are moving up, or down or not going anywhere.
With practice and experience, you will learn when to buy, when to sell and when to sit tight.