discovering types

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/12/datatype.html
Description:

Thank you for perfect documentation. Please add subchapter about discovering
types. Themes like List all available types, Get type of column with
pg_typeof() function, with sql into information_schema.columns, with psql \d
command etc.,
https://stackoverflow.com/questions/3827828/how-to-check-type-of-value-in-postgres.
Thank you in advance, Hans