Write a short teaching draft for an SEO beginner about interpreting keyword research metrics. This is a bounded lab exercise, not client copy. Use only the eight supplied facts and source references below. Do not browse, use tools, consult other conversations or use personal memory. Do not invent measured keyword values, experience, authors, results or claims about rankings. Preserve relevant qualifications. The explanation should be approximately 200-250 words.

Return: (1) a title, (2) a meta description, (3) the explanation with source letters adjacent to relevant claims, (4) proposed alt text for an as-yet-unmade teaching diagram comparing historical keyword metrics, ad forecasts and observed site performance, and (5) a JSON object containing only suggested BlogPosting headline and description values. Do not claim the image or a live page already exists. Return the draft only.

Source pack B05-KEYWORD-METRICS-v1, checked 2026-10-06:
1. Average monthly searches: Keyword Planner averages searches for a keyword and close variants over the selected period, location and Search Network settings. The default period is 12 months. Values are rounded. [A]
2. Competition: Keyword Planner's competition field describes advertiser competition for a keyword under the selected targeting. It is not a measure of organic ranking difficulty. [A]
3. Top-of-page bid ranges: Keyword Planner's low and high ranges approximate the 20th and 80th percentiles of historical top-of-page advertising bids, respectively, for the selected location and network. [A]
4. Forecasts: Keyword Planner forecasts concern possible advertising performance. Forecasted impressions account for bid, budget, seasonality and historical ad quality. These forecasts differ from historical search-volume metrics. [A]
5. Search Console measures: The Search results Performance report describes a site's Google Search performance. It includes clicks and impressions; CTR is clicks divided by impressions. [B]
6. Average position: Search Console reports average position using the topmost result for the relevant site or grouping. A new manual search can differ because results depend on time, location, device and search history. [B]
7. Query completeness: Some Search Console queries are omitted for privacy, and additional rows can be omitted because of internal limits. A visible query table is not an exhaustive list. [C]
8. Export caveat: In Search Console exports, values displayed as ~ or - in the report, meaning unavailable or not a number, become zeros. Those exported zeros require that context. [B]

[A] Google Ads Help, About Keyword Planner forecasts: https://support.google.com/google-ads/answer/3022575?hl=en
[B] Google Search Console Help, Performance report (Search results): Overview and basic setup: https://support.google.com/webmasters/answer/7576553?hl=en
[C] Google Search Console Help, Performance report (Search results): Dimensions and data groupings: https://support.google.com/webmasters/answer/17011259?hl=en&ref_topic=17010766