The problem and solution of the icon appearing in TortoiseSVN

1. The red exclamation point indicates that the file was modified locally after it was downloaded from the server. This is the time to perform the commit operation.
2. The yellow exclamation point indicates that the file was found to be conflicting at the time of submission, which means someone else changed the same version of the file before you submitted it.
At this point you need to view the file's history log, and the person who modified the file to communicate, the changes of two people to merge, after the completion of the merger marked to resolve the conflict, and then submit.
3. The Blue plus sign indicates that the file has just been executed with an "add" operation, but the commit operation has not yet been performed. This is the time to perform the commit operation.

The problem and solution of the icon appearing in TortoiseSVN