Hello! So I'm finally able to get a Ball Python. It isn't my first, I've owned several before, but I've had to give them away due to unfortunate moving circumstances. However, when I owned them, I knew nothing about morphs besides the existence of bananas *sigh* oh, young me. Well, I've done as much solo research as I can without my head exploding basically, but I can't plan further without asking specific questions Google doesn't want to help me with.
First and foremost, I do not plan on breeding right now. While I do want to breed as a hobby in the future, I am only looking to get one snake right now. I do not currently have the time or funds to breed. I want to get a female visible morph (please excuse my incorrect terminology as I still don't fully understand it), but am not able to spend over about $300. I have looked and looked, but unfortunately, my desperate love of Ball Pythons has stumped me. I love absolutely every one I see, and am unable to look at things from a breeder's perspective rather than an uneducated lover's perspective.
This leads me to my questions:
1.) Is there a specific starter morph that I can eventually get paired that will produce more valuable offspring? Ex - if I were to get a female Super Mojave for about $250, and then eventually another Super Mojave male for about the same price, and they produced Blue Eyed Lucy's, would that be a good investment?
^ I'm not sure the value of any morph offspring, and also I'm not entirely sure if Super Mojave's ARE BEL's...
Please also give me an example of any two morphs that cross to create valuable offspring, whether it's in my budget or not. I'm not very familiar with which morphs are worth money, or how they are produced. It's more for personal interest rather than a breeding plan.
2.) Are all Ball Python morphs compatible? I've read most Axanthic lines are not compatible with each other which makes me question how many BP's ARE compatible. Are the Axanthic lines special in that they're incompatible or is that a common thing with the morphs of the BP world?
3.) I just have a few terminology questions that, when typed into Google, only give me BP sale listings, so... What is a proven breeder, and what does "scaleless head" mean?

I'm so sorry for such a long post, and I'm sure most of my questions are making experienced breeders shake their heads in exasperation, so my apologies

Thank you in advance for any answers!