Hi Shally,
For Corporate actions Dhan has a detailed view. Please review this: https://community.dhan.co/t/introducing-corporate-actions-on-dhan/1878
For Dividends specifically, we have Dividend Tracker which is actively used by investors on Dhan. More on that is here: Introducing: Dividend View on Dhan - Product Announcements 🔈 - MadeForTrade