For context on fusion reactors I recommend edx's plasma physics and fusion course. From that it seemed fusion reactors that give a net power surplus, maybe, are just not possible in such confined envs on earth. 80 years of incredibly smart people with billions chasing the problem, with the first Tokamak reactor going back the 60s. Even ITER, the world's most expensive scientific endeavor ever, is still a question mark if it will work.
Would love to be convinced otherwise to be hopeful of confined fusion reactions on Earth.