Yoga or something else?

[BojackHorseman]

So I'm looking into yoga, was interested in tantra or kriya, and some people online said you can't learn without a guru.
First, is it true?
Second, let's suppose I can't (I live in a very small city in Europe, yoga teachers are rare and would probably Mcdojo material).
What then if I want to benefit of what yoga as to offer physically and spiritually, but can't do "real" yoga (supposing books are not enough and maybe even dangerous to practice solo, as some put it)? Is there any sort of valuable derivative that can be practiced solo?
And if not from indian tradition, maybe any other similar types of works (even if it has to be fragmented, say, learning this yoga teaching from this tradition, this from another one...) that could be learn alone?

[The Crocodile]

https://www.reddit.com/r/castaneda/