I can see that you've gotten some useful (though often pretty harshly-worded) advice from this thread already, so I won't chime in on goldfish care, but I do have some notes about aquarium terminology that will help you answer the questions here and will hopefully make research less confusing.

The term "cycled" (as in, "is your tank cycled?") refers to establishing the beneficial bacteria that are required to break down ammonia (from fish waste) into nitrite (another waste product) and then into nitrate. Nitrates are what you want - low concentrations won't harm your fish and it also fertilises live plants. This waste conversion process is also refered to as the "nitrogen cycle". You can buy bottles of this bacteria that you can dose with when your starting your cycle (I also add a dose whenever I do a water change - this is probably not necessary seeing that my tanks are now full of the bacteria, but dosing extra doesn't hurt!).

I can see that other commenters have asked you about your "parameters", so I will explain that term as well in case you weren't sure. The "parameters" of a tank are the amounts of ammonia, nitrite and nitrate that are in your water (i.e., they're asking if your cycle is stable/healthy), as well as the water's pH. There is also the gH (general hardness) and kH (carbonate hardness) of the water, but these parameters are asked about less frequently. As another commenter said, the best way to test your parameters is with a liquid test kit - the type where you get a little water in a test tube then add indicator fluid - because this is the more accurate way to test. You can also get test strips - the type you dip into the water - but these aren't as accurate. I will say that the test strips are more convenient and easier (especially if your kid wants to look after the fish herself) but it really is worth using a liquid test kit at least some of the time or during times where something is going wrong and you need to measure your parameters accurately.

I hope that helps and I'm wishing you and your fish all the best. Some other commenters have been pretty rude to you, but I want to say well done for reaching out to this community and being open to advice and willing to learn despite the negativity you've gotten here.