R dataframe delete the first column code example

Example 1: r data frame remove column

df$columnName <- NULL

Example 2: how to exclude columns in r

> Data$genome <- NULL
> head(Data)
   chr region
1 chr1    CDS
2 chr1   exon
3 chr1    CDS
4 chr1   exon
5 chr1    CDS
6 chr1   exon