lol that's okay ^_^ this is why we're here! So on the hole there are these microorganisms that we refer to as Beneficial Bacteria or BB. These are the good guys basically and you want to grow a colony of them because they actually keep your fish safe from those harmful levels of ammonia, nitrite and nitrates! So what happens is these BB eat ammonia and turn it into nitrite and then that is turned into nitrates which are taken out by water changes. Make sense so far?
So in order to grow your new colony of BB, they need a food source much like you need to feed your Betta daily ^_^ they eat ammonia first so with your fish in the tank, his poop will become their food. You would then be doing "Fish-In Cycling" because you're using your fish as the ammonia source. This does hurt the fish but many live through it as it's usually not deadly to healthy fish. But what will happen is as your colony of BB grow, the ammonia levels will rise and rise until they spike and start to decline as the BB start turning it into Nitrites. Then Nitrites will climb in concentration until they also spike and start to decline.
Soon after, nitrates join the party and the nitrites will decline. Once Ammonia and Nitrites are BOTH zero then your tank is officially cycled. That means you've grown your colony of Bacteria and they are actively turning Ammonia into Nitrite into Nitrate for you to take out of the water with a water change!
There are other way's of cycling your tank (growing your colony) which do not include your fish getting hurt. The easiest way is to go out and get a bottle of Tetra Safe Start, it's basically a bottle of bacteria. You'll pour the entire thing in and wait two weeks, check your levels weekly though because sometimes you'll get a bottle of dead bacteria :-/ so if you see your levels getting wildly out of hand, do a water change and get a new bottle of bacteria if you want to go that route.
With Fish In cycling it usually takes about a month to completely grow your colony of Bacteria and this doesn't mean that you shouldn't skip out on your weekly water changes but it keeps your fish safe during the week when it's just the filter and the water
If none of that makes sense, I'll try to reword it better lol, I know it's a lot to take in at first so no worries. Ask all the questions that you need to!