Multiple front ends hosting with the same SSO Cognito login

I created an aws amplify back end as follows:

```
amplify init
```
```
amplify add auth
```
```
amplify push
```
```
amplify publish
```

Once this was done I created a front end and used the amplify pull command in the front end app

```
amplify pull --appId ************* --envName *******
```

I wanted to host this app so in the front end app I did

```
amplify init
```
```
amplify add hosting
```
```
amplify push
```
```
amplify publish
```

For the other front ends that i wanted to use the same backend on i created them in the same way and this works fine.

Is this the correct way to do this if so if i make changes to the cognito how would i get the updates to show on the front end?

Next when a user is logged into one how would I make is so they dont have to log into the app front ends?