I'm not sure if my list is comprehensive, but:
- news reporting
- columns/editorials (opinion pieces)
- essays (including investigative journalism, popular science etc)
and minor forms like headlines or summaries(blurbs) for front page or RSS, live reporting (minute-by-minute newsfeeds), taglines and so on.
These are just forms of publication and they branch into hundreds sub-genres by subject. Smartphone or Video Game reviews are just form of Reviews, and while the subject is different, the structure is the same as reviews of cars or restaurants from a hundred years ago. Similarly, an essay on Higgs' Boson will probably be of similar structure as one on AC Voltage from times of Tesla (popular science) and one on biography of Diego Maradona will be similar to biography of Winston Churchill (biographical essay). So don't get blinded by the variety of subjects - the number of actual core forms of journalism is much smaller.
Also, these are for actual publishing, but you will be required to write letters to interviewees, request publications, write reports for your superiors, prepare polls questions and handle many more genres that never show up in print, but are necessary to perform the job.
(note there are also other forms of journalism but they are usually handled by respective specialists - photojournalism, live TV news reporting, copywriting etc, but these are rarely handled by journalists.)