After English? With what purpose?
As a kid I was in France a lot, learnt plenty from real world speaking, but got a U in my GCSE
As an adult I worked in Germany and found spoken German fairly easy to learn, as in follow what people are saying and go about my daily life - don't fancy my chances with writing or passing any exams though. Worked in Holland, got almost nowhere with speaking Dutch but could follow some of it (some similarities to English). Worked in Italy, had a translator, those folks speak crazy fast . . .
FWIW Spanish and Portuguese are very different, Spanish is very useful in many parts of the world