Finally, with assist from peers, I was able to create this simple bread board.
Initially, I set the board with only few wires just to make sure whole electricity flows smoothly from power adapter -> voltage regulator-> red LED.
The view of both voltage regulator and momentary switch (both of wires should've been red).
This LED will always glow anytime I press the switch, meaning an 'indicator' to figure out whether the board gets electricity or not.
Yellow LED's luminosity varies by Potentiometer. (When soldering, It was tricky to tell which is Input, Ground and Output at first. I found it's better to have blue wire in center.)
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