Go to Suleymaniye Cultural Details Centre. This center is really an NGO managed by volunteers who also work inside the Suleymaniye Mosque. They provide free specifics of Islam and also the Islamic tradition the two In the mosque and in their center. They've an interesting presentation about Islam and mosques. https://istanbulpersonalportfolio76059.bloggip.com/37083601/the-definitive-guide-to-istanbul-wordpress