Best way to use and install Linux (Ubuntu) using two hard drives

I'm currently looking to switch from Windows 10 to Ubuntu 18.04 LTS (not dual-booting, Ubuntu only). On Windows I've used my 128GB SSD for OS-files almost exclusively, while all other stuff goes to my 2TB SSHD. How do I effectively use both my hard-drives on Linux? Can I, like on Windows, have the Linux OS-files set-up on my SSD for a fast boot and all other files on my SSHD? I've read that my "swap partition" should be on my SSHD since it's so large in size. How much size should I give it when I have 16GB DDR3 ram? I'm open to suggestions, I just want my new install to go smoothly and not waste an entire hard drive. Thanks.