Based on your game history, you are new to Destiny 2. As such, you’ll need to complete the new player “A Guardian Rises” quest line before you can move on to other stories and modes. When you open your Director, tab over to the Quests page, and you should have the quest there. You can set it as your active quest to track it, and then simply follow the steps that the quest is asking you to complete. Once you’ve taken care of that quest line, you’ll be able to travel to other places, including Europa. That is when you can start into the Beyond Light campaign, and you’ll also be better geared for the challenges ahead, thanks to your earlier efforts.