Lesson 1: "Don't be greedy."
I understood, but seeing others double their money makes me itch.
Lesson 2: "Don't go all in."
I remembered, but when placing an order, I thought, "This time it will definitely work."
Lesson 3: "Strictly set stop losses."
I set it up, but ended up getting hit precisely before a V-shaped reversal.
The final graduation summary is just one sentence:
"The market does not punish the ignorant; the market only teaches you to respect it."
The tuition I paid is called principal, and the certificate I received is called a margin call message.