VB.Net methods used in UIPath Academy Training

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There are properties and methods used in the training that sometimes aren’t clearly explained. Hitting F1 doesn’t jump to a .net reference. It seems a bit difficult to find if you are not familiar with .NET

For example there is a row(index).ToString which I would think would indicate the row in a datatable however it was in a For Each row so clearly this would have to refer to a column.

I went to help for .NET and still couldn’t clearly find an answer I just had to figure it out which isn’t good. Are there any good resources other than MS documentation which would be good for newbies so that we can be effective in UIPath?