Hello, i have a 5 level character (3 phantom rogue, 2 undead warlock), and i don't know what level spells i can learn. Can anyone help me out?

You do not get to know any spells a a phantom rogue so your spells knowm are the same as for a level 2 undead warlock.

Therefore you know 2 cantrips and 3 level 1 spells.

You may have access to other spells depending on options you have taken

• Some eldritch invocations add to your spells know for example armor of shadows enables you to know the mage armor spell (and cast it at will)
• Some races give you access to spells for example as a level 5 character if you wer Githzerai you would know mage hand, shield and detect thoughts.
• Some feats give you access to spells for example Fey Touched enables you to know misty step and another spell of 1st level

Thanks a lot!