
Apples. Eggs. Small boxes. Sweets. Erasers. Japanese looks at the ordinary little things around you and gives them a counter of their own.
個 is widely used for small, discrete objects. When you are unsure which specialised counter belongs to a small object, 個 is one of the most useful counters to recognise.
That small っ from your earlier Japanese has found a job. Listen to the clipped rhythm before こ.

Most forms simply add こ. One, six, eight and ten tighten into っこ.
二個 · 三個 · 四個 · 五個
七個 · 九個 · 何個
一個 · 六個 · 八個 · 十個
The question is simple: なんこ. The answer changes only with the number.

A counter stops feeling like grammar when somebody is waiting for you to finish ordering.
Six eggs are 六個. Somewhere between the refrigerator and the frying pan, pronunciation practice has quietly entered breakfast.

個 can follow many ordinary objects whose individuality matters more than their shape.

Sometimes the most useful number is simply one more.
At home, at work or in a shop, the pattern travels easily from counting to planning.
Find small separate objects in the room: fruit, stationery, small containers or something else ordinary. Count them aloud, then ask yourself 何個ありますか.
Notice small objects as individual things.
Practise いっこ・ろっこ・はっこ・じゅっこ.
Ask for one more: もう一個ください。

Japanese counters can sound complicated until you notice what they are really doing: paying attention to the things around you. Fruit in a bowl. An eraser on a desk. Eggs waiting for breakfast. Language has been hiding in the room all along.