EdSpen

Hi there, I am in a somewhat weird situation job-wise, and I was wondering if I could get help with the upcoming self-assessment deadline. I have two jobs. One at a company where I earn 20k a year and have my wages taxed on the payslip, i.e., they show what's been taken out, but I also work as a journalist, and I make less than 10k in total. So, as a tax newbie, I was just wondering if I have to do a self-assessment form, and when I declare my earnings, I add both jobs' incomes up or just the writing income. Sorry if this is complicated