Hello!
Here are the four main beliefs of Buddhism:
• Four Noble Truths (To live is to suffer).
• Dukha (Suffering is caused by desire).
• Tanha (One can eliminate suffering by eliminating all attachments).
• Noble Eightfold Path (View, Intention, Speech, Action, Livelihood, Effort, Mindfulness, Concentration).
I hope you found this to be helpful! :)