The link teaches nothing comprehensive or worth while about Bitcoin
Just his price history and I don't think that's what newbie should be checking out.
Like is usually recommended here, I would recommend mastering Bitcoin by Andreas M. Antonopoulos.
It did help me in understanding most basic terms and the forum helped with finishing touches and improvement.
Mastering bitcoin is good for people if they want to know some technical information about bitcoin like how seed phrase is generated and how addresses are generated. Also if they want to know about bitcoin networks and nodes. It is very useful for people that read it.
But what the OP posted is good for newbies to know bitcoin price history. It can let learn and know when to invest and when not to invest in bitcoin.
The choice about when and when not to invest has always been on the interest of the investor based on his or her investment goals and objectives and risk tolerance level, those that make of the DCA might not necessarily be looking at when and when not to invest as a factor of the market conditions, but might investment invest based on the availability of their investment money to execute by order, some buys through the Lump sum while can also buy whenever there is dip but however, the combination of the strategies will not be bad provided the investor have the financial ability and on the second note the market has been known for it unpredictability making it very difficult to accurately know when to and when not to invest and because of that buying whenever we have our investment money ready is the best if holding is the plan especially for newbies because if they keep looking at the market fluctuation they can not buy or invest.