At my day job, I'm working on a project moving retirement and pension data out of a 30+ year old mainframe system into a replacement system that is still being

At my day job, I'm working on a project moving retirement and pension data out of a 30+ year old mainframe system into a replacement system that is still being built in .NET/Angular. As a side project, I'm working on building a class to teach people ETL using whatever data integration tool we choose (currently Talend, but want to keep it agnostic). It's meant to be tailored to complete newbies as well as people coming from other backgrounds (software, BI, etc.) as part of a bootcamp. Note that I'm a full stack dev. who got pulled into the data world as I've done so much of it, and am currently interested in bridging the gap.