Is there a nice cheat sheet or manual explaining the language of writing programming-commands into uiPath?

we would recommend that you will take a crash course on VB.Net (or C#) for getting the basics
VB.Net Programming Tutorial

There are several posts that do list statements for a particular topic (e.g. date, data table)..
Currently, we are working on rolling out such a cheatsheet series. Have a look here:

1 Like