Is the indicator the SMC? What style?

No indicator used there, it was just what I thought might happen. I don't use indicators as you can't trust them completely.

how can the price suddenly move like it did today?

$HIVE is quite an illiquid asset and a slightly bigger order can create a spike like that. It can trigger stops and create a cascade, which pushes price higher or lower, quite a lot. As you can see, price has almost retraced since then, as there was not enough buying pressure to hold price at that level.

With a 25% increase, that is, you need purchase volume, how do you anticipate that?

You don't as no one knows where price is going to go, but you have to know how to react in each situation, this is why we have 3 scenarios most of the times. I drew that on my chart as I was hoping to get that, but you need to know your levels and know when to enter, when you get your confirmation and when your idea is invalidated.

Congrats for taking interest in trading and good luck with learning. It requires a lot of time spent in front of the screen, learning, testing, backtesting, but you'll get there.