A catchy buzzwordy title. 40 chars max.
Give a brief summary of the area in which the intern is going to be working. Keep it short, simple and attractive. 200 chars max.
In one, short paragraph, give a catchy, written summary of the entire track. 200 chars min, 600 chars max.
Here, give a bulleted list of skills and technologies, the intern will most likely have to deal with in the internship and therefore is required to be willing to put a signification effort into learning them. But we don't expect them to know them beforehand. Also here, keep it fun and engaging, but also, don't downplay the challenges of learning new technologies, because we do want them to start the internship with the necessary attitude and willingness to hustle your way into new knowledge.