Steps to Combine S1 and S2 Data

I want to combine S1 and S2 data for Random Forest Crop classification. I have read the topics in the forum but I’m really confused in Coregistration and stacking either I need to coregister all images of S1 and S2 or simply stack them ???
and after which transformation may apply like PCI that can give better results.

If you Terrain Correct your SAR images you can simply stack them with the S2.

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Check this post, but basically the answer is what @ABraun has suggested

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