GitHub API rate limit errors usually occur when requests exceed GitHub’s permitted limits, particularly for unauthenticated requests. To mitigate this, generate a personal access token (PAT) and include it in your API calls for higher rate limits. Implementing request caching for frequently fetched data reduces the need for redundant API calls. Additionally, reviewing your API usage patterns and optimizing request frequency can help. To check rate limits, use `GET /rate_limit` endpoint, which provides information on remaining requests. Properly managing API requests not only avoids rate limits but also enhances the efficiency of GitHub interactions.