"working knowledge" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "working knowledge (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Candidates must have a working knowledge of standard Windows applications.",
          "type": "example"
        },
        {
          "text": "He has an excellent knowledge of Community law and a sound working knowledge of financial law and practice.",
          "type": "example"
        }
      ],
      "glosses": [
        "A knowledge of how to make something work without deeper theoretical understanding of why it works."
      ],
      "id": "en-working_knowledge-en-noun-4qOPvAA-",
      "links": [
        [
          "how",
          "how"
        ],
        [
          "work",
          "work"
        ],
        [
          "understanding",
          "understanding"
        ],
        [
          "why",
          "why"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "knowledge of how to make something work",
          "word": "käytännön osaaminen"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "knowledge of how to make something work",
          "tags": [
            "masculine"
          ],
          "word": "conhecimento prático"
        }
      ]
    }
  ],
  "word": "working knowledge"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "working knowledge (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "English uncountable nouns"
      ],
      "examples": [
        {
          "text": "Candidates must have a working knowledge of standard Windows applications.",
          "type": "example"
        },
        {
          "text": "He has an excellent knowledge of Community law and a sound working knowledge of financial law and practice.",
          "type": "example"
        }
      ],
      "glosses": [
        "A knowledge of how to make something work without deeper theoretical understanding of why it works."
      ],
      "links": [
        [
          "how",
          "how"
        ],
        [
          "work",
          "work"
        ],
        [
          "understanding",
          "understanding"
        ],
        [
          "why",
          "why"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "knowledge of how to make something work",
      "word": "käytännön osaaminen"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "knowledge of how to make something work",
      "tags": [
        "masculine"
      ],
      "word": "conhecimento prático"
    }
  ],
  "word": "working knowledge"
}