I understand your questions.
Yes, there are people who are infected and show no symptoms. There are people who are severly impacted by this. And some who only have some or moderate symptoms. I personally know 2 people who were/are asymptomatic- they had 0 symptoms but their spouses were laid out by the virus.
Yes, the CDC and the WHO said that wearing masks wouldn't help at first. Then scientific evidence showed that masks did help, because covid isn't airborne but transmitted via water droplets. They followed solid science by taking a position based off of available evidence, and then when new evidence came to light, they changed their position because of facts.
Which is exactly what you want in a scientist. Yes, having all the right answers on day 1 would be nice, but it's not a realistic expectation.
Being outside helps a lot because the droplets are dispersed faster and better.
Yes, social distancing helps.
Yes, masks do work. Less about keeping you from getting it and more keeping you from giving it to others.
I have seen it effectively explained like this: Imagine that you are standing next to someone. Neither of you are wearing pants. he starts peeing. You are going to get pee on your leg.
Now imagine that you are 6 feet apart. Still no pants. He starts peeing again. You will likely get some pee on you. But not that much.
Now, imagine that you're 6 feet apart and just you are wearing pants. He is still peeing on everything. While your pants might get some pee on them, it likely won't soak through to your skin.
Now, you have fresh pants on. You're 6 feet apart. AND this time the Mad Pee-er has pants on as well. He starts peeing again. But this time, he only pees on himself because his pants stop it.
This is why it's important for everyone to wear a mask. Because YOU could be one of the people who is infected but shows no symptoms. We know now that people are infectious early and don't show symptoms for days or weeks.
We also know that being indoors in close contact with an infected person is the worst.
Just stay home.
If you have to go outside, wear a mask.
Wash your hands, a lot. For at least 20 seconds. With lots of soap.
I hope I was able to answer your questions in a way that was meaningful for you.