Hi I have a question about how to file income earned abroad.

I have to file both my 2017 & 2018 returns. Originally I was told by TurboTax that I didn't earn enough money abroad to require filing for 2017 but now, from what I understand it is required.

In 2017 I moved from the USA to Europe. (I have dual citizenship)
I earned a total of about $3000 in the US
and about ?13,000 in Europe for the whole year.

My question is, How to report Income earned abroad?
Is it sufficient to report it in form 2555? Or is it also necessary to report foreign income in my 1040 line 7? (obviously I don't have a W2 from my European income.)

Any help would be much appreciated!
Many thanks.