Answers for "what is elevatedButton in flutter"

flutter raisedbutton example

RaisedButton(child: Text("Rock & Roll"),
                onPressed: _changeText,
                color: Colors.red,
                textColor: Colors.yellow,
                padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
                splashColor: Colors.grey,
              )

flutter info button

//_tooltipKey is defined as final _tooltipKey = GlobalKey();
Tooltip(
          key: _tooltipKey,
          message: S.of(context).dishSpicinessRatingExplanation,
          textStyle: regularTextStyle.copyWith(color: Colors.white),
          preferBelow: false,
          child: IconButton(
            icon: FaIcon(FontAwesomeIcons.infoCircle, color: Colors.black45),
            onPressed: (){
              final dynamic tooltip = _tooltipKey.currentState;
              tooltip.ensureTooltipVisible();
            },
          )
        )