[neom]

Depends what you're trying to do, light weight bio weapons are pretty easy to make, not an expert but there is ammonia and chlorine that can be used easily. I presume cytotoxins are among the easier of the "bad ones", but the precursors are monitored. that said, I think the risk here isn't about teaching people how to make the stuff we know about, it's about inventing new stuff we've not thought about?

[rimunroe]

Those are examples of chemical agents. Bioweapons (biological weapons) are weaponized pathogens like viruses or bacteria.