How do I attach garter stitch strips together to make a blanket?

So, I have been teaching myself to knit from this website, and it is phenomenal! Thank you so much to everyone on here.

Can someone tell me how to attach garter stitch strips (or scarves, haha) together to make a blanket? I made the “pattern” myself, thinking I could attach it together myself and just figure it out, but it’s proving to be more difficult than I thought.

I saw that the mattress stitch was recommended, but I didn’t use the stockinette stitch, and am not sure where/how I should attach it.

Any help would be greatly appreciated.


Info here

It’s the mattress stitch. It’s the best for a beginner.

Thank you both so very much…That’s super helpful!