Have to(suggesting obligation to attend a seminar)

You have to attend a seminar.

Explanation:

'Have to' is used to express general obligations, duties, or necessities (as opposed to 'must', which expresses specific obligations) in the present, the future, or the past. In the future or the past, 'must' and 'need' are always replaced by 'have to'.

Yet, in the negative form, 'don't have to' means there´s no obligation or necessity, but it can be done. ('You don't have to cook' means you can still do it if you fancy to).

what is the question you are trying to ask here

i believe it would be the first one the importance of internet safety

explanation:

because now and days kids don't know what the can find on the internet they can find dark web, 4 chan ect. if we don't teach them internet safety anything can happen.

(don't search up,dark web,4 chan u have been warned)