I had a project that seemed to lend itself to "workflows", and SharePoint workflows seemed like a good starting point.
Happily, my company has "personal sites" off the main corporate site. I was able to create a subsite, downloaded SharePoint Designer 2013, read a couple of tutorials and I was able to create a "custom list" and write a little "list workflow" that did everything I wanted. Yay.
My next challenge was to "clean up" the "New" and "Edit" .aspx forms. I considered going to InfoPath or PowerApps, but I was confident I could either a) modify the form somewhere in SharePoint or SharePoint Designer, b) find some decent "modify .aspx form" in MSVS/Office Tools, or c) hack the .aspx directly (e.g. in Notepad). WRONG ON ALL COUNTS.
It appears InfoPath is deprecated, so I thought it might be time to learn some PowerApps. I didn't want to "mess up" my work, so I decided to create a new subsite and export/import my work from the original subsite. WRONG AGAIN: SharePoint Designer "exports" the workflow as a .wsp ... and I can't "activate" the .wsp in my new subsite. It looks like I'm blocked with "Export/import", too!
Q: How can I tell what version of SharePoint my "personal site" is running? I suspect "SharePoint 2016", On-premises. How can I tell?
Q: Are any lists or workflows I create in SharePoint Designer 2013 a "dead end"? Must I switch tools?
Q: What are the "right technologies" to be using in order to implement a viable SharePoint workflow in the year 2020? SharePoint "Add-ins"? Or "something else"?
Q: Are "List Workflows" still viable going forward? I believe "yes". But if not, what is the preferred alternative?