I have had a chance to try Ariv and I must say it's a wonderful app for any slack user (beginner or advanced)
Ariv made it easy for me to search key information from the heap of slack messages.
I really like the interests feature, gives me a daily digest of messages pertaining to my interest.
The best part is that all this information is found by Ariv's AI. Unlike some other apps, I did not have to manually bookmark/note important messages.
If you are a slack user, I highly recommend checking out Ariv.