Lot of basic things that is covered in online tutorial does not really required to have beefy PC. In fact, the most of fundamental functionality can be performed with older version of Photoshop… and those does not requires much in the modern computing. (though change in Adobe policy about using older version is bit of issue)
Do, your potato PC might be just sufficient for covering online tutorial. And I would strongly suggest just installing them.
There might be some functionality that will be limited due to restriction to memory or VRAM, but normally photoshop do handle things reasonably well on older machines.
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