When preparing to become a data analyst, the first step is to assess your current skills and identify your strengths and weaknesses. Online tools like Skill Assessments or Data Analyst Nanodegree can be used to evaluate proficiency in data analysis concepts and tools. Core skills you will need include data manipulation and visualization, such as working with different types of data (structured, unstructured, streaming) and using tools like Excel, SQL, Python, R, or Tableau to clean, transform, and visualize it. Additionally, knowledge of basic statistical concepts (descriptive statistics, inference, hypothesis testing, regression analysis) and econometric methods (time series analysis, panel data analysis, causal inference) is necessary. Furthermore, having business and domain knowledge is essential for understanding the context and objectives of data analysis projects and translating data insights into actionable recommendations. It is also important to have some knowledge of the industry or domain you want to work in (finance, marketing, health care).