Page 30, basic rules, D&D, free download from WoTC web site. Cantrips
At 1st level, you know three cantrips of your choice from
the wizard spell list. You learn additional wizard cantrips
of your choice at higher levels, as shown in the Cantrips
Known column of the Wizard table.
Spellbook
At 1st level, you have a spellbook containing six 1st-level
wizard spells of your choice. Your spellbook is the
repository of the wizard spells you know, except your
cantrips, which are fixed in your mind.