My gateway drug was MyHeritage. But I soon learned that they make money off all the data people enter for free, so I was looking for something else. I started adding my tree to WikiTree - as I like the idea of "one global tree". Because, why should several people maintain all the same records at various levels of detail?
But as this takes the "wiki" part in the name pretty seriously and only provides few fields for the data, I soon began using Gramps to turn my growing collection of data into a database. I also dabbled a bit with webtrees - which is also not too bad.
However, soon after switching from Linux to MacOS, I found MacFamilyTree and it's mobile counterpart (which has all the same features as the desktop version). And that's what I'm using for the past few years now. Especially the seamless FamilySearch integration is great to find new details or even new relatives.