Does export in schema mode also includes tablespaces? I am executing an expdp command in schema mode. I'm just curious if it also exports tablespaces. I'm total newbie in oracle databases. What if I want to export schemas and tablespaces? What mode do I need to use?
Yes it does.
https://docs.oracle.com/cd/E11882_01/server.112/e22490/dp_export.htm#i1007519

Tablespace Mode
A tablespace export is specified using the TABLESPACES
parameter. In tablespace mode, only the tables contained in a
specified set of tablespaces are unloaded. If a table is unloaded,
then its dependent objects are also unloaded. Both object metadata and
data are unloaded. In tablespace mode, if any part of a table resides
in the specified set, then that table and all of its dependent objects
are exported.

e.g.
expdp hr DIRECTORY=pump DUMPFILE=tbs456.dmp TABLESPACES=tbs_4, tbs_5, tbs_6