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If you want to study rowhammer, apply to the vrije universiteit amsterdam and follow their hardware security course. It’s a lot of fun!

They are the authors behind trrespass and smash. In their classes, when I followed them, we went into their research extensively.

Do I literally have to quit my job, apply to the university, get accepted, enroll in the class, to experience this?

Universities don't demand that you not work while studying, so that's really not necessary.

A study visa in the Netherlands is not a work visa, you also need enough cash to sustain yourself or some kind of sponsor[1].

I’m guessing this is something that can be done online, hopefully for free?

Nope, I live in Amsterdam