Raised Bed Plans Would Like Some Advice On Raised Veggie Garden Beds?

Would like some Advice on raised veggie garden beds? - raised bed plans

I thought the creation of about 3 feet by 5 feet of raised beds, but you do not know how high to make the beds. I was counting on 2x6 or 2x8 boards, or should it be higher? Only to go to 2x8 instead of 2x6, rising wood prices almost doubled. Thank you, and any advice would be appreciated. I try to check my garden better and make you ugly.