Address A, 0.1
Address B, !
"!" means sending all the remaining balance to address B.
Note that you may need using coin control feature to avoid extra inputs.
I always wanted to know how can I send the maximum amount without any confusion but never tried to learn lol. Had no idea about this. Thanks a lot man. Learned something new but easy trick.
You're technically right. Though this is something I don't expect the typical person is capable of doing correctly. Most people are simply a lot better fit to use hardware wallets.
I have used Paper wallet once in the lifetime though I didn't follow the secured method. In fact, I didn't know that wallet generating through online could be hacked. It was the beginning of my crypto exploring. I used that wallet for few months and then moved all the coins I had. After that, I have purchased HW and still using them.