In Go, you do not always have to close channels. It’s important to note that channels will be garbage collected once they are no longer referenced, regardless of whether they are closed or not. Closing a channel is primarily a signal to the receiving goroutines that no more data will be sent on the channel. Here are some guidelines:

• Do not close a channel from the receiver side and avoid closing a channel if it has multiple concurrent senders.
• Only close a channel in a sender goroutine if the sender is the only sender of the channel.
• It’s generally safe to leave a channel open, especially if you’re not checking for its closure state.
• Closing a channel can be a good practice to prevent unnecessary blocking or resource leaks, but it’s not mandatory.

Always consider the specific use case and the lifetime of your goroutines and channels when deciding whether to close a channel.