The main source on the planet is oxides. These are stones with a blue coating that look exactly the same as ordinary gray stones. You can find a small oxite, then collect it with your hands. Or you can stumble upon oxite cobblestones, which you need to break with a pickaxe.
Then open inventory and move the oxit to any quick access slot. After that, click on the desired key that is responsible for this access cell to instantly apply the oxyt on yourself.
The second option is to create a device called "Oxidizer".
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To do this, you will have to invest heavily in the technology branch. After creating the device, install it in any shelter or cave, and then fill it with oxite. It will automatically generate oxygen.