Where can find Web Content Material for Design?

I may ask a noob question here, not about coding. But on the content of website. I got search over the net about where and how I can find the content material for designing website to build my portfolio. Yet I can't find any. Not sure what they call, I called them website content material, is liked company profile or identity with those related presentable content to develop a website.

So, as the question, where I can find those concent to develop the content of website. Or actually I should create myself? Thank you.