I played golf for thirty years, then switched to tennis three and a half years ago. Have an 8 handicap in golf, and am already sitting at between a 3.5 and 4.0 in tennis. The golf swing is a lot like the tennis forehand. Weight is back, and weight has to transfer forward. Except in golf, you are not stepping in like in a good tennis stroke, you arer just moving your weight onto your left side (if right handed). In both golf and tennis, you need a good shoulder turn.
Like in tennis, in golf you have to groove your stroke. Also like in tennis, proper technique is critical if you ever want to play at a high level. Lastly, hand-eye coordination helps in both sports.