Select prompting mode for Slackware Linux installation. I would also recommend you choosing full mode as Slackware recommend it. It's quick, easy and the most foolproof choice. In full mode, Slackware just install everything without prompting you even once. The installation process takes a few minutes. So you can use the time for...errr eat biscuits?
I should warn you about the newbie mode. Even if you are a newbie, I'm not recommend it to you. In newbie mode, Slackware will prompt you for each package it's going to install. And that's going to take a few hours to finish the installation. However it's good if you want details about each package that is going to be installed in your system. Just lay your hand beside the space bar.