How do you prevent mould from growing?

2 months ago I posted a question regarding my bathroom ceiling in the house that I rent, it’s got a lot of black mould. Today I decided to clean the mould off my bedroom windows since it grows easily due to the windows not being very airtight. Found black mould on my closet door in the process, and then found a whole wall of mould at the top of my closet. I’ve used bleach and water for the windows and now a spray called “Exit Mould” for my closet. But my room gets a lot of ventilation and sunlight, so how am I supposed to prevent it from growing back in a few months?

No wonder I’ve been having breathing and sinus problems for months, all this time I thought it was just the bathroom causing it. I’m scared to keep looking and find even more mould.. it’s never ending.
How do you prevent mould from growing?
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