In earlier times it was always the mantra to borrow as much as you can and put it to work, as money became easier to borrow it became necessary to limit how much you borrowed
I agree with shabandri , choose shares with adequate dividends and debt for an asset is different to debt for a e.g. holiday, also as long as the share debt is not part of a larger debt envelope
But have a stop loss in place and diversify so that you are not in one segment of the market. Remember that it easier to loose the lot in shares than it is in property so that aspect must be covered.
Good luck and remember as always DYOR because what suits me may not suit you
