Part of my role was a part time secondment to the regional school improvement service. Colleagues were presenting on pedagogy and good practice they had seen.
Again, it was professionals telling me what works and things they had seen which looked great.
Part of the presentation touched on the work of professor John Hattie
Effect sizes were explained showing that EVERYTHING I knew worked now had research behind it.
I immediately went to Amazon and bought John Hattie's book