The "templater" plugin is like adding an entire scripting language to Obsidian. As a coder in a previous life, I really like that!
And the "dataview" plugin basically allows some slice and dice database functionality to your vault(s).
Of course, the calendar plugin is just that... used all the time. LOL
Glad I could help you out.
Logseq has been easier to start working with right-out-of-the gate.
My Obsidian is in read mode, lot’s to digest.