Here is some advice for studying vocabulary from the KGU Open Campus on March 26th, 2023.
General English
New General Service List , BNC/COCA
Specialized Lists
TOEIC , Business , Academic (a newer list) , Academic (an older list that is still really good)
Online Dictionaries with Example Sentences: Weblio , ALC
Free Online Concordancers: COCA (you will need to make a free account) , LexTutor
Here are some resources you can use to help practice listening: Lyrics Training (practice listening through songs), Elllo (natural conversations for learners)
Here are some useful study apps for vocabulary: Anki , Quizlet