Sorry for a simple question, but what does “cycle” mean?
Pond Cycle or Nitrogen cycle as its otherwise called is the process the water in your pond will undergo as it "stabilizes" - its typically started by ammonia (comes from fish, frogs etc.) that is converted by bacteria to nitrites that are then converted to nitrates. Plants like nitrates and consume those and the cycle once established will be mostly self sustaining...
You typically want "0" Ammonia, "0" Nitrite and close to "0" nitrate to have a healthy ecosystem in your pond.
If you feed your fish too much, you will get more ammonia, which means you need more bacteria (good type) in your filters to help with converting that and you need more filtration in the form of plants etc.
That's my 30s explanation.
Here is the first link i found when i searched with Bing:
How to Cycle a Pond for Fish (Step-by-Step) - Pond Informer
How to safely cycle a pond ready for koi or goldfish. Article includes useful information, tips, and steps to ensure the best water conditions.
pondinformer.com
and a quick YT video also:
I am sure others on here can help with more info also but if you understand this, you can get a pond that is balanced and your fish will be happier.
PS - i ask the silly questions all the time - it's better to ask i have always found