How do I get the bug net?

Solution 1:

The Bug Net is sold in Beedle's shop in Skyloft. Beedle's shop is the flying building that is making an orbit around the Bazaar in the daytime. You will need either the Slingshot or the Beetle to ring the bell and cause Beedle to lower the rope so you can get into the shop. It will cost 50 rupees once you get up there.

After getting it, speak to Gondo in the bazaar to see what treasures you will need to collect in order to upgrade it to the Big Bug Net, making it soooo much easier to catch things.

Solution 2:

Beedle sells the Bug Net at his store. You need to get to his store in Skyloft during the day. It will cost you 50 Rupees to purchase it.