learning fintech

hello for everyone.

the main goal of this topic is gather trusted resources for learning fintech
and probably personally pieces of advise
I'm interested in how to become a really professional in modern fintech

I've already had strong programming skills(c#, .net, t-sql, js)
and expirience in one real local fintech project(online issuance of loans)
also I've already known where and how to find this tech stuff around IT

what i need is trusted resources which help me to understand and learn fintech area
i'm looking for web sites, books, forums, online cources, just pieces of advices

and I'm sure that I have to improve my programming skills or change attention to another technology which more needed for fintech.

In other word:
I have IT background and enough expirience in software development
But I don't know anything about fintech
and ask you to help me and send me on right road.