Call sign mnemonics
YOUR / RPT1 / RPT2 memory aids that stick.
To help remind me which Call Sign (CS) value is which, I use these tricks to keep the values straight.
YOUR is where I put YOUR call sign, repeater, or reflector.
RPT1 rhymes with FROM.
RPT2 rhymes with TO.
Beyond that, the main thing to remember is that RPT2 must be set to a repeater Gateway to use features of D-STAR that make use of the Internet.
It takes some practice, but hopefully these memonics will help. See also gateway repeaters, callsign routing, and set MY correctly first in getting started.