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Which part of it? The part about IPFS I learned from the curation and community groups that have formed around Dtube - I'm not normally a video content creator so I've really learned a lot in a short time from the people who know more about Dtube than I do. It's pretty cool and relevant, when we talk about how special the community is here, and how it's in our hands to really educate! Any hosting platform could poof your videos or content out of existence (because of resources, censorshi... you name it), no matter who or how big they are. IPFS does mean that you can make sure your content is pinned and hosted yourself, but it does also mean a tiny bit of extra work/resources to have that control.

As for your text on the chain, that's the underlying basis of what Steem is all about! If you ever want to see what a post really looks like, and the basics of what actually goes into the chain, take a look at your post on Steemd. For example, if you look at this post itself in it's text form on the blockchain (click here) you can see what the post actually looks like. You can also see that images and video are permanently included in terms of the link to the content hosting, but the actual media itself is off-chain at those locations. The text as I wrote it (so, perhaps, a text transcript of the video or an explainer) is in the chain for good.

Let me know if I can help you meet up with some experienced Dtubers who can help answer more questions!