Pick N’ Pull also around holidays like Memorial Days will have a 50% sale usually. So that engine might be around $75 at that time (don’t forget they will probably hit you with a core charge, here in Chicago they hit you with an enviromental charge but that’s minor).
The other thing will be the weight of the engine, like the previous post from Flintiron, you probably need an engine lift and probably a stand. But most importantly, what type of vehicle or brand do you like? There’s a difference between makers as well as things like weight.
I would also agree if you are getting into working on engines without any knowledge, I would look for things like lawnmowers and small engines to begin with. After that, read up on stuff in the meantime like engines that have timing chains vs timing belts. A jumped timing could absolutely ruin a motor and you would just be taking apart an engine without any resolve.
American or Import? Subaru boxer? VW VR6 or 1.8T? Chevy 1.6L? Mopar 340 V-8?
But also if you are just going to junk yards to look for now, read on how to check for a good engine or how to spot neglect. It’s pretty basic but checking for sludged oil and fouled plugs/coils and checking plugs with gauges will get you into understanding very basic introductions with engines.