Dynamically return all column names

Hi

In power query i have the following which dynamically reads the column names for outputting. Im just wondering if there is a cleaner solution whereby i dont have to transform each column but rather leave it as transform all columns in list. This will allow my source to have more columns than it does at present. Also can it determine the type of each column? Appreciate any help or advice on this as im new to Power BI

let
Source = Csv.Document(Web.Contents("http:xxxxx"),[Delimiter=",", Columns=18, Encoding=1252, QuoteStyle=QuoteStyle.None]),
#"Promoted Headers" = Table.PromoteHeaders(Source, [PromoteAllScalars=true]),
DynamicNameHeader = Table.ColumnNames (#"Promoted Headers"),
#"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{{Table.ColumnNames (#"Promoted Headers"){0}, type text}, {Table.ColumnNames (#"Promoted Headers"){1}, type number}, {Table.ColumnNames (#"Promoted Headers"){2}, type number}, {Table.ColumnNames (#"Promoted Headers"){3}, type number}, {Table.ColumnNames (#"Promoted Headers"){4}, type number}, {Table.ColumnNames (#"Promoted Headers"){5}, type number}, {Table.ColumnNames (#"Promoted Headers"){6}, type number}, {Table.ColumnNames (#"Promoted Headers"){7}, type number}, {Table.ColumnNames (#"Promoted Headers"){8}, type number}, {Table.ColumnNames (#"Promoted Headers"){9}, type number}, {Table.ColumnNames (#"Promoted Headers"){10}, type number}, {Table.ColumnNames (#"Promoted Headers"){11}, type number}, {Table.ColumnNames (#"Promoted Headers"){12}, type number}, {Table.ColumnNames (#"Promoted Headers"){13}, type number}, {Table.ColumnNames (#"Promoted Headers"){14}, type number}, {Table.ColumnNames (#"Promoted Headers"){15}, type number}, {Table.ColumnNames (#"Promoted Headers"){16}, type number}, {Table.ColumnNames (#"Promoted Headers"){17}, type number}})
in
#"Changed Type"