With the release of New Light and Destiny 2 going the free route, several changes took effect. One of them is that the new 'base' is 750 Power. Levels also don't exist in-game anymore, so on some apps, it may show that you're starting at level 20 (which was the original max back in the day). Along with the above, new characters and characters that hadn't played the beginning of Destiny 2 will go through the waking up part of becoming a Guardian. This is the first mission you mentioned that was in Destiny 1. Upon completion, the rest of the game will open up for you. This was done to allow new players to jump into things with friends that are later on. You can go to Amanda Holiday in the Tower and pick up the Red War quest (This is the Base Destiny 2 campaign) as well as the Questlines for Curse of Osiris and Warmind. Those three quest starters from Amanda Holiday are the campaigns for D2 and the first two DLCs. So, the Red War is where you want to begin if you want to experience the full Destiny 2 experience. Please bear in mind that if you view any mission information or walkthroughs for things that were created prior to October 1st, 2019, that they may be outdated and show incorrect information. For example, the rewards for completing some of the missions as part of the Red War were removed as mission rewards and were put into the normal drop pools for equipment and the like. This was done so that people that chose to skip these legacy missions can still get them. - Lastly. Welcome, new Guardian!