Tooltips

<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="top"
                title="Tooltip on top">
            Tooltip on top
        </button>
        <button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="right"
                title="Tooltip on right">
            Tooltip on right
        </button>
        <button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="bottom"
                title="Tooltip on bottom">
            Tooltip on bottom
        </button>
        <button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="left"
                title="Tooltip on left">
            Tooltip on left
        </button>
        <button type="button" class="btn btn-secondary" data-toggle="tooltip" data-html="true"
                title="<em>Tooltip</em> <u>with</u> <b>HTML</b>">
            Tooltip with HTML
        </button>