Merge multiple tables

Power Query (https://www.youtube.com/watch?v=AhaNv3Iis3c)

let
    Source = Folder.Files("C:\Users\seven\Documents\Documents\CC"),
    #"Added Custom1" = Table.AddColumn(Source, "Custom.1", each getData([Folder Path]&[Name])),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom1",{"Content", "Date accessed", "Date modified", "Date created", "Attributes", "Folder Path", "Extension"}),
    #"Replaced Value" = Table.ReplaceValue(#"Removed Columns",".csv","",Replacer.ReplaceText,{"Name"}),
    #"Expanded Custom.1" = Table.ExpandTableColumn(#"Replaced Value", "Custom.1", {"Belegdatum", "Eingangstag", "Verwendungszweck", "Fremdwährung", "Betrag", "Kurs", "Betrag_1", "Währung"}, {"Belegdatum", "Eingangstag", "Verwendungszweck", "Fremdwährung", "Betrag", "Kurs", "Betrag_1", "Währung"})
in
    #"Expanded Custom.1"

Thank you, Czeslaw. I will look into this. Obviously, it does not help that I do not understand Russian to understand the video (if the video is Russian...) but I think I can get it together