As an individual that was heavily bullied in primary school which then rolled on into high school my stance on bulling is that it’s not on! I would encourage any students to seek out my help if they need someone to talk to in the classroom whilst making them aware that in serious cases I’ll let the principal know. Cyberbulling is a rather tricky situation though as teachers can’t always see this happening. In minor cases I would still maybe try and follow the typical, ‘try to ignore it and move on’ but if I can see that it’s intent was to cause harm I’d push for removal of the content or raise the issue with the principal.
I find the government site https://www.esafety.gov.au/ to be something useful but I would hope that most issues can be resolved in the classroom.