Desigining
Schematic Design
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Installed Eagle to my laptop. Loaded the fab class lib file. I learned about commands of net/ label/ name/ move/ group/ show/ board as essentials. Eagle sometimes behaves inconsistently. When I placed the parts and connected lines to each end of parts, it sometimes did not reflected the connection on the board view. Charles taught me several options: relaunch eagle and make sure you open both board and schematic design when you make some changes. Putting the dots on the connections between lines and components.
Board Design
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It took unexpectedly long time to design the borad properly. Want to know 'design patterns' for electronic circuits. Autorouting did not work. I placed each wiring by hand. Pressing Alt and grid guideline by 16 mil. helped a lot to avoid gaps less than 16 mil. the milling tool size.
Milling
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When milling the circuit, I changed z to .65. When cutting out the board, I changed offsets from 1 to 3, and cut depth from .6 to .65 to make sure it cut through. The circuit lines might have been too thin.
Soldering
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I used blue led and 500 ohm for the led resistor.