Systems Data Macbook Pro M3

Been only 3 weeks, spent my all college on-campus earnings (2150 USD) on Macbook Pro M3 Pro, used windows my whole life. Was really excited for the huge investment but getting the biggest dissapointment. The system data just keeps getting over 400 GB for nothing. In 3 weeks, it happened for the 4th time. The first time, screen recording file in the library folder was 200 gb, God knows why. Only recorded two short videos by then. Deleted that folder. Second time, was running a ML model on Colab notebook but on local machine, suddenly the session crashed saying RAM is full. My RAM is 18 gb and the model wasn't that large, but anyway, I don't know how, the system data also got full. But this time, there wasn't any filled folder like screen recording or such, system data was just randomly over 400. Restarted, got fixed. Assuming full RAM also took all the storage, which I do not know how. The next 2 times, there was nothing, no model running, no heavy task, the system data was just 400 gb out of nowhere. Restarting fixed again. But spending 2150 dollar on the greatest brand named laptop after switching from windows and facing the weirdest issue possible, why? How to solve it? Or is there any way at all? I know about checking library folders, but as I said, that was only the first time, when one folder, screen recording, took over the whole space. It is very dissapointing. Would really appreciate any solution.