congrats!

a few early tips:

.. if new to such boxes... first few weeks, spend time and effort to learn.
.. ethernet always work better than wifi.
.. use of mouse is required for some apps.
.. some apps are easier/more reliable to use than others; most apps need updated versions after a while.
.. this box is capable of a lot of advanced and high quality video and audio capabilities.
.. video/audio output are a consequence of source+player+display; so, good sources are key.
.. local playback with native player is easy and produce excellent video and audio output, esp with a 4k tv and home theater.