The key to being a successful CK3 player above all else is to not give up. One mistake 30 years in the past in-game can suddenly end in loss of titles and land, and as a beginner, it can be hard to keep an eye out for these unexpected pitfalls. Don't give up if you lose landĭespite your best efforts, successions will not always go smoothly wars will rage across your lands, and your relatives won't always be content to hang out on the sidelines while you control the realm. When the heir inherits, they'll remain in control of any lands that are de jure a part of that title, even if a lower rank title passes to one of their siblings. Your highest rank will always be your character's Primary title, and it will always pass to their heir. Lastly, if you're a King who has formed multiple Kingdoms, you'll want to create an Empire. That gives you early advantage since you can easly gain more lands and be the most powerful person in the land.
Most rulers are count-tier which means they have up to 3 counties which is low. If you're a Duke who controls multiple Duchies, you'll want to form a Kingdom. For begginers, Ireland with a starting date of 1066 is a good choice for couple of reasons. In that case, you'll want to form a Duchy. So, suppose you're a Count who holds several Counties. The way to prevent loss of land under Confederate Partition is to form a domain that will give you a rank superior to any other titles under your control.