higher ohm value => higher resistance => less voltage & amperage can pass through.

lower ohm value => lower resistance => more voltage and amperage can pass though.

Examples:

0 ohm means there is 0 resistance. The voltage and amperage can pass through the resistor 99.99999%

1K ohm means 1000 ohm resistance. The voltage and amperage can pass the resistor but with LESS values on the exit side.

Playing with resistor value enables you to manipulate voltage out, especially for any IC with voltage reference pin.