General cross-toolchain tutorial recommendation

The book states:
> The LFS book is not (and does not contain) a general tutorial to build a cross- (or native) toolchain. Don't use the commands in the book for a cross-toolchain for some purpose other than building LFS, unless you really understand what you are doing.
Could you folks recommend me a general tutorial to build a cross-toolchain? I intend to build my own personal Linux distribution. I was going to use LFS' cross-compilation procedure before reading the above note.
Which are the deficiencies of LFS' procedure that can't make it general?

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