its an isekai and the mc was given the ability to have an encyclopedia about the world he was in and i'm pretty sure he had 2 teachers, one was for magic and the other one was for swordsmanship and after they were done teaching him, the mc gave them an item box which was rare (?) in their world
(reminder that i'm honestly not sure about the second part, if it was a different manga from the one im looking for)
THE WAY HE WENT FOR THAT INDIRECT FRENCH KISS BY SUCKING ON HIS SHIRT??? WHAT A FREAK OUH LALA