knew

I am an intermediate bridge player. I play on occasion with a more advanced player. I was told as responder{my partner opens 1 clubs]} I can respond 1 heart with 4-5 heart but donot repeat the hearts even if I have 5???? I was referred to the Bridge Bulletin, April 2017 pg 57. There is an example near the bottom page where responder has 5 heart {8,6,5,4,2} I understand this example that I would not repeat the suit. Can we rebid 5 card major?????at the 2 level as responder?? Lets say I have 6-9 HCP... Thanks