It would benefit the student to have access to a D&D 5th Edition Player's Handbook so they can decide ahead of time what kind of character they'd like to have.

学習者は、Outschoolが提供する基本ツール以外のアプリやウェブサイトを使用する必要はありません。

Dungeons & Dragons is a roleplaying game that involves players to defeat monsters and villains using imaginary swords, axes, hammers, bows and magic.  The violence involved is imaginary.  The use of alcohol is a trope in this game, but not actually a key aspect - for example, the players will meet in a tavern to receive quests.
There are monsters such as witches and devils in Dungeons & Dragons. Players will sometimes run across these creatures in their games, but they aren't intended to be worshiped or idolized - they are often written into the story with the expressed intention that they be defeated.