Adobe Fusion 360 is a very powerful, very complete tool for modeling and designing all sorts of objects in 2D or 3D. You can design anything from simple, flat stickers to a complex, multi-part engine with many moving parts (and see them working together) to a house. This program can be used by designers, engineers, architects, you name it. The range of applications is mind-boggling. You can even get a free license if you only want to use as a hobbyist, so even the price is right. The pro license is also pretty affordable if you use it for your business (just over $40/month if you pay yearly, at the time I'm writing this).
Can be a little complicated to use, with the user interface being a little arcane sometimes, e.g. extended tooltips describe the tool in a vague manner which doesn't provide much info to the user. Although there are a number of video tutorials available, most of them refer to older versions. There were a number of big changes in the software fairly recent and a lot of the tutorials, even in their own website, are outdated, using commands or tools that are no longer available or have changed since the video was made. Most of the tutorials/help articles are in video format, which can make it hard to follow along while trying to reproduce what they're teaching you. Also, most of the answers you find in the forums refer to older versions too.
I've encountered some stability issues, with the program sometimes freezing or crashing, so make sure you save your projects often.
I also wish their support for meshes was better. As it is, it's almost nonexistent... other than importing the meshes and displaying them on the screen, you can't really do much if you only have a STL or OBJ file that you need to modify. You might have to end up redesigning the whole thing from scratch if you want to change it.
I currently use Fusion 360 alongside with a couple of other applications, depending on the specifics of the project. Sometimes it's easier to model objects in simpler applications like Vectary or even Tinkercad, especially if you have to start from existing STL/OBJ files.Fusion 360 definitely has a lot of functionality and it is very powerful, but it can be overkill for simple applications if you only need to sketch something out really quickly.