The American Psychological Association (APA) is a scientific and professional organization based in the US. Its mission is to advance psychological knowledge. It is a valuable source of information about psychological research and careers in psychology.
These resources are categorised by topic and range from Addictions to Women & Men. Many of these topics are relevant to your study of IB Psychology.
There are also featured topics. At the time of writing the featured topic was “Minority Mental Health”. There are fascinating posts on Asian-American bullying and victimization and Transgender people and gender expression as well as Psychological issues related to immigration.
If you are interested in undertaking the Extended Essay in psychology, this site is an excellent place to start browsing for topics.