Basing one’s understanding on what one doesn’t see seems like a pretty shaky way to go, and isn’t what the Buddha suggested, but if that’s what you want to try, then go for it.
There are a few problems with just quoting buddhist teachings out of context, the way some evangelical preachers cite this or that Bible scripture.
Firstly, the text cited may be meant to convey an entirely different message than what the person sharing the quote is trying to say.
Second, the translation using English language terminology may be faulty. This is or was especially the case early on with translations of Theravada texts, mostly done by British transistors who used terms such as ‘sin’ , ‘salvation’ , ‘enlightenment’ which do not necessarily convey the meaning of the Pali or the understanding of the terms from what would have been an Indian way of experience.
There are certainly many types of meditation as well as methods for developing strong concentration, not to mention plenty of techniques for navigating life, reducing stress, and so on.
But as I said in my first reply, to answer your question ‘what does Buddhism teach?’ (Which is, a LOT of things) you really do have to look at what the Buddha was specifically addressing. Otherwise this is like someone who wants to fix their car learning how to bake a cake. They might end up with some good cake, and there are plenty of recipes for cake, but their car is still broken.
What differentiates the Buddha’s teaching from all other paths is that he identifies grasping the permanent-seeming experience of “me” (and the offshoot belief that a continuous ‘soul’ or ‘atman’ functions as awareness) itself as the cause of perpetual rebirth.
The path he lays out is specifically based on the premise that no such continuous ‘self’ truly exists, although there is no denying that the illusory experience of a continuous self occurs. That experience is definitely happening as a projection of mind. Hence, the goal of liberation his teaching aims to achieve is also different than that of other spiritual belief systems. He isn’t teaching how to become one with Brahma, or how to get to Heaven and see Jesus.
Any teacher can draw a map that leads to somewhere. The map the Buddha drew leads specifically to liberation from samsaric rebirth, both moment-to-moment if one gains realization in this lifetime, as well as after the dissolution of the physical body at the time of death.
Some other theories may exist about what happens after death, or how to meditate, but that doesn’t mean they are the same as Buddha’s Dharma.