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All I learned was in Italian and from Facebook groups or telegrams, it's not a very shared knowledge as it's a good way to profit without too big risks so people are not really willing to share

I found this in English, it's a good introduction

https://www.championbets.com.au/news-article/betfair

What I'm referring when talking about trading is similar to what it's explained in the chapter "Betfair trading" (but you gotta read the previous ones to understand)

This one looks decent too : https://tradeonsports.co.uk/pre-match-trading-on-the-exchanges/