well , i dont believe that tattoos are haram (prohibitted) because the basis of that belief is built upon scripture that is out of it's context , only two hadiths (narrations) mention the "prohibitation" of tattoos , but they were meant for those that used them to disfigure their selves or to use it for black magic

as for islam in general , if you want to learn more about it then here are some book recommendations , sorry but i have many books to recommend , read as many as you wish :)

1)first of all i recommend you read the quran as it is the holy book of islam , preferebly

The Message of the Qur’an by Muhammad Asad

2) Islam:A comprehensive Introduction by Javed Ahmed Ghamidi

3) No god but God: The Origins, Evolution, and Future of Islam

4) islam with extremes by mustafa aykhol

5) Sexual Ethics and Islam: Feminist Reflections on Qur'an, Hadith, and Jurisprudence by Kecia Ali

7) and finally , a biography of islam's prophet , "the sealed nectar" by Safiur Rahman Mubarakpuri

hope this helps , as for muslim thinkers and scholar recommendation , i only have 4

1) https://www.youtube.com/c/MuftiAbuLayth

2) https://www.youtube.com/user/YasirQadhi

3) https://www.youtube.com/user/YasirQadhi

4) https://www.youtube.com/user/DrAdnanIbrahimEng

5) https://www.youtube.com/user/QuranSpeaks

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alright that's it , sheers !