2011 Outback 3.6R Limited 2013 Crosstrek (traded) 2020 Outback premium pkg11
Both suggestions above are a great start. Make sure you're maintenance is up to date. unfortunately since you know nothing you kinda gotta do it all. The on thing I would add is that the 5eat automatic transmission DOES have a filter that you can change and I would highly recommend that you do so. It cannot be had from the dealership or a parts store you need to snatch it from Ebay. You will need almost 6 qts of Subaru or idemitsu HP transmission fluid.