set foldmethod=indent
set foldnestmax=10
set nofoldenable
set foldlevel=2

set foldmethod=syntax

set foldmethod=indent

'foldmethod' 'fdm'      string (default: "manual")
                        local to window
                        {not in Vi}
                        {not available when compiled without the +folding
                        feature}
        The kind of folding used for the current window.  Possible values:
        fold-manual     manual      Folds are created manually.
        fold-indent     indent      Lines with equal indent form a fold.
        fold-expr       expr        'foldexpr' gives the fold level of a line.
        fold-marker     marker      Markers are used to specify folds.
        fold-syntax     syntax      Syntax highlighting items specify folds.
        fold-diff       diff        Fold text that is not changed.