At first I built a few bases on Angel I to put some storage down and start getting advanced coils for my machines. My latest base is in Biitula because of the central location, no atmosphere protection, and an excellent hub in the local Portal Seekers. I’m currently building a store so I wanted to be able to make affordable portals to a variety of places. The blinksec distances, and number of conduits for a portal, are pretty complex but this spreadsheet helped with it a ton. If you’re looking for other references there’s a good list of links here. As for navigating the networks, its sometimes tough to get around since there are so many independent networks that don’t necessarily coordinate but I tend to start with TNT and Portal Seekers since I’m in the US. TNT is pretty straightforward and there’s a map for the PS network.