X3 vs V2 - version and tutorial confusion

I have recently started a project for some specific parser. I started to
learn Spirit but given the state the homepage some things seem unclear to
me:

Spirit has 3 versions
- classic (V1.8)
- X2 (V2.5.6)
- X3

However, while reading the  X3 docs
<https://www.boost.org/doc/libs/1_67_0/libs/spirit/doc/x3/html/index.html>  
it's significantly shorter compared to  V2 docs
<https://www.boost.org/doc/libs/1_68_0/libs/spirit/doc/html/index.html>  
which leaves me in questions:

- Is X3 actually complete? Or just beta of the future, full X3 version?
- Is X3 a replcement of X2 parser only? Other tasks such as error handling
are not covered in X3 docs
- Does linked X3 tutorial cover everything? I have build the fun-calc
example but it contains a lot of stuff which was not covered in the tutorial
- should I read X2 docs too?
- Where can I find detailed docs about the API? For example, the X3 tutorial
says to use  as an argument to parse function to ignore whitespace but does
not list any alternatives neither list how they work.
- There does not seem to be any full X3 doc availale which would list all
functions/classes from the library

If for any reason you would like to reach me in a different way -  here is a
reddit thread
<https://old.reddit.com/r/cpp_questions/comments/9aiy79/boost_spirit_x3_questions/>  



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