Also, if you’re looking at Genki, they just released the third edition (which is what you posted the link to). I haven’t seen it myself, but from what I’ve heard the difference between the second and third editions is basically changes to example sentences, so it might work out better if you look for the second edition instead - it’ll probably have all of the same stuff and be cheaper.
I personally used the second edition when I was starting out and I liked it a lot, but I did use it in a college setting so there’s that. I’m personally a fan of physical textbooks because technology is distracting but to each their own, maybe you’ll find online books work for you.
Best of luck!