chack those it can help before starting :
UBOAT Quick Guides YT
https://www.youtube.com/playlist?lis...eDvvPFUNJWeghN
Starting new game advices
https://steamcommunity.com/app/49484...17420751588184
Keybingings
https://steamcommunity.com/sharedfil...?id=1728891370
the ingame tutorial seems to be buggy, I just went straight to sandbox mode