Add external links to intro PM topics (#5867)

* add external links to intro PM topics

* lifecycle and development links

src/data/roadmaps/product-manager/content/development@5okUFVMuG6mjRki4fyCcF.md

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 # Development 
 
 The development phase of the product development lifecycle is a critical stage where ideas transform into tangible products. For product managers, this phase involves coordinating with cross-functional teams, including engineering, design, and quality assurance, to ensure that the product meets its specifications and market requirements. This phase focuses on building, testing, and refining the product, incorporating feedback from iterative testing and addressing any technical challenges that arise. Effective management during this stage is essential for aligning the product with its strategic goals and preparing it for a successful launch.
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+Learn more from the following resources:
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+- [@video@What's Product Development?](https://www.youtube.com/watch?v=jLvMGnAYicY)
+- [@article@What is Product Development?](https://www.aha.io/roadmapping/guide/what-is-product-development)

src/data/roadmaps/product-manager/content/key-skills@5W-3jh1-4qSU5kagrWv9z.md

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 # Key Skills for a Product Manager
 
 A Product Manager is often viewed as the "CEO of the Product", requiring a unique blend of business, technical, and strategic skills to drive the product's success. Core competencies for a Product Manager typically include strategic thinking, the ability to influence cross-functional teams, technical proficiency, understanding of customer needs and market trends, problem-solving abilities, and exceptional communication skills. These key skills are vital in managing stakeholders, formulating strategic product vision, making crucial business decisions, and ensuring seamless product execution. The ability to continuously learn and adapt is also crucial due to the dynamic nature of the product management industry.
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+Learn more from the following resources:
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+- [@article@What Skills Does a Product Manager Need?](https://careerfoundry.com/en/blog/product-management/product-manager-skills/)
+- [@video@Skills Every Product Manager Needs](https://www.youtube.com/watch?v=ysBpePyeHkU)

src/data/roadmaps/product-manager/content/product-development-lifecycle@kB8e26BUm8BpTY1_O3N3_.md

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 # Product Development Lifecycle
 
 The Product Development Lifecycle is a crucial aspect for Product Managers to understand. It represents the systematic and methodical journey a product takes from conceptual idea to market distribution. This lifecycle consists of several distinct stages such as ideation, design, development, testing, and launch. Developing a thorough comprehension of this process enables Product Managers to effectively manage, predict and strategize around the potential challenges and opportunities each stage presents. This understanding is vital for successful product launches, maximizing product potential, and ensuring alignment with market demands and customer expectations.
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+Learn more from the following resources:
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+- [@article@Product Development Lifecycle - MailChimp](https://mailchimp.com/resources/product-life-cycle/)

src/data/roadmaps/product-manager/content/product-vs-project-management@V-IeFB9S2tToxANHIzpMs.md

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 Project management focuses on planning, executing, and closing specific projects with defined objectives, timelines, and deliverables, ensuring that tasks are completed on time and within budget. It is concerned with the successful completion of a project, often involving temporary endeavors with a clear beginning and end. In contrast, product management is a continuous process that involves the entire lifecycle of a product, from ideation and development to market launch and ongoing improvements.
 
 Product managers are responsible for defining the product vision, strategy, and roadmap, ensuring that the product meets customer needs and business goals. They work cross-functionally with teams like engineering, marketing, and sales to deliver a product that provides value over its entire lifecycle. While project managers focus on the execution of specific initiatives, product managers concentrate on the long-term success and evolution of a product.
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+Learn more from the following resources:
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+- [@article@Product vs Project Manager - Coursera](https://www.coursera.org/gb/articles/product-manager-vs-project-manager)
+- [@video@Product Manager vs Project Manager](https://www.youtube.com/watch?v=nPR6HsUO_XY)

src/data/roadmaps/product-manager/content/roles-and-responsibilities@Dx6ee8P_Agpw1MLKlAPGI.md

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 # Roles and Responsibilities of a Product Manager
 
 A product manager is a pivotal role that stands at the crossroads of business, technology, and user experience aspects. Their roles and responsibilities include understanding customer needs, defining and communicating product strategy, prioritizing product features, liaising with different teams such as engineering, sales and marketing to ensure seamless product development and launch, monitoring and analyzing market trends, and ultimately driving the success of the product in the market. A prodigious product manager, with a unique blend of business acuity and technical knack, can significantly impact the product's acceptance in the market and the company's bottom line.
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+Learn more from the following resources:
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+- [@article@Product Manager Roles & Responsibilities](https://www.productside.com/product-manager-roles-and-responsibilities-keytask/)

src/data/roadmaps/product-manager/content/what-is-product-management@luk1vnpy0duneVjen8WzO.md

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 # What is Product Management?
 
 Product management is a multifaceted discipline that forms the backbone of any technology organization. As a product manager, individuals are responsible for guiding the success of a product and leading the cross-functional team that is responsible for improving it. This entails an understanding of the market, the competitive landscape, customer demand and preferences, as well as business strategy. The decisions made by the product manager directly influence the strategic direction, design, functionality, and commercial success of the product. They essentially form a bridge between different teams, such as engineering, design, marketing, sales, and customer support, ensuring a seamless transition from product development to product release.
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+Learn more from the following resources:
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+- [@article@What is Product Management? - Product Plan](https://www.productplan.com/learn/what-is-product-management/#what-is-product-management)
+- [@video@What is Product Management? - Atlassian](https://www.youtube.com/watch?v=kzMBIyzq9Ag)