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Sam of Simple Samples 5,541 Reputation points
2021-02-14T16:34:29.177+00:00 The official documentation is at Language reference for Visual Basic for Applications (VBA). The formal syntax is available in a PDF at VBA Language Specification. The VBA Language Specification however answers the question about all the syntax for VBA expressions. I suspect that you are actually looking for something that explains VBA and that the documentation is inadequate for you.
Look at Workbook.ActiveChart property. It is a Chart object. They have a Chart.SeriesCollection method that returns either a single Series object or a collection of Series objects. You can similarly drill down from there.
You may also find the following website useful.
It contains a complete list of all the VBA built-in functions and operators.