Guidance Needed with Resizing Product Images

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Hi! I was previously using an app to automatically resize my product images because a lot come in several different sizes and look dreadful on my collection pages. Some were longer than the others, and I wanted them to be neat & the same size. Anyhow - due to COVID, I cannot afford extra apps, so I was forced to delete the one I was using, Does anyone know where & how I can insert code to automatically resize images? Here's where I got stuck (I know clothing, not code lol):

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