Understanding the difference between get and select

get extracts the value and returns a single value or list if multiple keys have been specified.

~> {a: 1, b: 2, c: 3} | get b
2
~> {a: 1, b: 2, c: 3} | get b c
╭───┬───╮
│ 0 │ 2 │
│ 1 │ 3 │
╰───┴───╯

select maintains the nushell values and returns the records selected by column name or key.

~> {a: 1, b: 2, c: 3} | select b
╭───┬───╮
│ b │ 2 │
╰───┴───╯
~> {a: 1, b: 2, c: 3} | select b c
╭───┬───╮
│ b │ 2 │
│ c │ 3 │
╰───┴───╯