This is the 839th most frequent Swedish word.
vanliga
"Vanliga" means "common" or "ordinary" in English.
Here, 'vanliga' is used in its superlative form as a part of the definite form 'vanligaste', meaning 'most common'.
De vanligaste förklaringarna till problemet är enkla.
The most common explanations for the problem are simple.
The word 'vanliga' acts here as a plural indefinite adjective modifying 'symtom' (symptoms), meaning 'common'.
Vanliga symtom inkluderar hosta och feber.
Common symptoms include cough and fever.
In this sentence, 'vanliga' functions as a plural adjective describing 'misstag' (mistakes), meaning 'common'.