Reddit communities are also known as subreddits. To view the Reddit communities you will need to access the Reddit website or mobile app and follow the steps given below:

By using the Reddit website:

1.  If you have a Reddit account, you need to log in yourself by clicking on the "Log in" button in the top-right corner of the page. 
2. if you don't have a Reddit account, you can still browse Reddit without logging in.
3. Once you visit the Reddit homepage a search bar is located at the top. You can search for specific subreddits or Reddit communities in the search bar. For example, if you are interested in photography, you can type "photography" into the search bar and search.
4.  As you start typing in the search bar, Reddit will suggest matching subreddits or communities. Click on the one you are interested in, and you will be taken to the subreddit's page.

By using the Reddit Mobile App:

1.  If you do have not a Reddit mobile application download and install the official Reddit mobile application from the app store, and open them.
2.  You can browse Reddit without logging in as on the website. If you log in Reddit app, it gives you access to your subscribed subreddits and allows you to engage more fully with the platform.
3.  Find the search icon on the main page of the Reddit application. Click or tap on the search icon to open the search bar.
4.  Follow step 3 mentioned in "By using Reddit website".

Check your connection first, then reconnect and reload the page. Check the status of Reddit to see whether it's down. If you're using the Reddit app (iOS/Android), follow these steps: This problem is caused by a flaw in the Reddit app; I will not go into depth; simply re-open the Reddit app.

One of the reasons you are unable to view this community is that it does not exist. Another reason could be that the community was private, requiring you to be invited by the moderators. It's possible that the link to the community is broken, so double-check it.