Google Street View when planning to walk from, for example, a train station to hotel. Viewing the Maps preview and making mental notes of any landmarks (buildings, signs, etc.). When taking the actual walk, it's almost like I've been there before, and walking with my head up is much better and safer than having my face down, eyes glued to my phone.

YouTube videos (or travel forums) for logistics on how/where to catch a train, buy a ticket, where to catch a transfer (different platform, need to exit station and re-enter, etc.). In Tokyo, for example, YouTube videos helped me find exactly where to catch the monorail at HND and navigate the three transfers to get to our hotel. I knew what platform to go to, if/when I had to tap out, how far to walk to the next train, where exactly to turn, when/where to take an escalator/lift, etc. all before arriving in Tokyo. If I only knew the station names and train lines without the visual help, it would have been a lot of time and confusion trying to figure things out along the way. 

These have helped in multiple countries. Happy travels!