Welcome to the forum @farukhcasy2
Clever title given its a user forum. 
But in all seriousness, sorry to hear of the struggles and perception you have encountered with the app. What specific challenges related to specific features are you having issues with? Are you approaching it from the standpoint of needing to add code past what the designer has created, or simply from the standpoint of making design edits to what the designer has provided?
If you can be more specific then I’m sure someone can assist in helping you move forward.
As the others have said above the video tutorials and resources created by @Eldar are far and away the most comprehensive and complete that you will find outside of the Blocs documentation itself.
Good news also it sounds like the next version of Blocs supposedly set to release not too much longer, will have added features to help both designers and developers - whichever you might be.