When you gain a new level, you get to add two more spells to your spellbook of any level you can cast at no extra cost. He's assuming you are adding spells of the highest level you can cast.
1st - start with 3 + INT modifier 1st level spells + all cantrips
2nd - add 2 1st level spells
3rd - add 2 2nd level spells
4th - add 2 2nd level spells
5th - add 2 3rd level spells
6th - add 2 3rd level spells
7th - add 2 4th level spells
1st - start with 3 + INT modifier 1st level spells + all cantrips
2nd - add 2 1st level spells
3rd - add 2 2nd level spells
4th - add 2 2nd level spells
5th - add 2 3rd level spells
6th - add 2 3rd level spells
7th - add 2 4th level spells
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