This very much depends on the subject, I suspect. For math or computer science, wikipedia is an excellent source, and the credentials of the editors maintaining those areas are formidable (to say the least). Their explanations of the underlaying mechanisms are in my experience a little variable in quality, but I haven’t found one that’s even close to outright wrong.

They may laugh now, but you’re gonna kick ass when you get isekai’d.

Not trying to be that guy I swear, have you got a source? That number seems pretty high, even for Israel.