What I'm worried about is my content. I'm hoping to keep this site running for a long time, constantly adding and updating it. What concerns me is that most of my content is taken from forums about the niche, where someone writes a guide about constructing something. I copy it, change a lot of the wording and put it on my site, no credit to the original source. Because I change it so much I don't think it needs to be credited to them, It looks like it is my own creation. I'm wondering if I will be penalized in the end for this? I'm basically stealing information/guides from forums posted by other people and changing 30% of the words and posting it on my site as my own. Also if the guide has pictures, I copy them into my own articles. Am I wasting a lot of my time? Will It eventually get taken down/penalized in the SERPs? Thanks.