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2
Power BI Basics 📊🚀

👉 Power BI is one of the most popular Business Intelligence BI tools used for:
Data visualization
Dashboard creation
Business reporting

It is widely used by:
Data Analysts
Business Analysts
Data Scientists

🔹 1. What is Power BI?
Power BI is a Microsoft tool used to transform raw data into:
📊 Interactive dashboards
📈 Reports
📉 Visual insights

🔥 2. Components of Power BI
Power BI Desktop
👉 Used to create reports & dashboards.

Power BI Service
👉 Cloud platform for sharing reports online.

Power BI Mobile
👉 Access dashboards on mobile devices.

🔹 3. Power BI Workflow
Data → Cleaning → Modeling → Visualization → Dashboard → Sharing

🔹 4. Connecting Data Sources
Power BI can connect with:
Excel
SQL Database
CSV Files
APIs
Cloud services

🔹 5. Power Query Data Cleaning
Used for:
Removing duplicates
Changing data types
Filtering rows
Merging data

👉 Similar to data cleaning in Pandas.

🔹 6. Data Modeling
👉 Relationships between tables.

Examples:
One-to-Many
Many-to-One

🔥 7. Visualizations in Power BI
Popular visuals:
Bar Chart
Line Chart
Pie Chart
Table
KPI Cards
Maps

🔹 8. DAX Data Analysis Expressions
DAX is the formula language of Power BI.

Example:
Total Sales = SUM(Sales[Amount])

🔹 9. Why Power BI is Important?
Highly demanded skill
Used in real companies
Important for dashboards & reporting
Great for storytelling with data

🎯 Today’s Goal
Understand Power BI basics
Learn workflow
Understand Power Query & DAX
Learn dashboard concepts

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1
Which company developed Power BI?
Anonymous Quiz
5%
A) Google
82%
B) Microsoft
2%
C) Amazon
11%
D) IBM
1
Which component of Power BI is mainly used to create reports?
Anonymous Quiz
2%
A) Power BI Mobile
17%
B) Power BI Service
64%
C) Power BI Desktop
17%
D) Power Query
1
Which Power BI feature is mainly used for data cleaning and transformation?
Anonymous Quiz
60%
A) Power Query
24%
B) DAX
13%
C) Dashboard
3%
D) KPI Card
1
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1
Dashboard Design Principles 📊🎨

👉 Creating dashboards is not just about charts.

A good dashboard should be:

Clear

Interactive

Easy to understand

Business-focused

🔹 1. What is a Dashboard?

A dashboard is a visual interface that shows:

📈 KPIs

📊 Charts

📉 Business insights

👉 Used for decision-making.

🔥 2. Goals of a Good Dashboard

Show important insights quickly

Reduce confusion

Help users take action

🔹 3. Key Dashboard Principles

Keep It Simple

Too many visuals = confusion

Use only important charts

Use Proper Chart Types

Purpose : Best Chart

Comparison : Bar Chart

Trends : Line Chart

Distribution : Histogram

Percentage : Pie Chart

Maintain Visual Hierarchy

👉 Important KPIs should appear at the top.

Example:

Revenue

Profit

Customer Count

🔹 4. Use Consistent Colors

Same color for same category

Avoid too many bright colors

Example:

🟢 Profit

🔴 Loss

🔹 5. Add Filters & Interactivity

Use:

Slicers

Drill-through

Dropdown filters

👉 Helps users explore data.

🔹 6. Dashboard Layout Best Practices

Top Section

👉 KPIs & summary cards

Middle Section

👉 Main charts

Bottom Section

👉 Detailed tables

🔹 7. Common Dashboard Mistakes

Too much data

Wrong chart selection

Poor color choices

Cluttered layout

🔹 8. Storytelling with Data

A dashboard should answer:

What happened?

Why did it happen?

What should we do next?

🔹 9. Why Dashboard Design Matters?

Better business decisions

Improved user experience

Professional reporting

🎯 Today’s Goal

Learn dashboard principles

Understand chart selection

Learn layout & storytelling

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4
Which chart is best for showing trends over time?
Anonymous Quiz
9%
A) Pie Chart
20%
B) Histogram
65%
C) Line Chart
6%
D) Scatter Plot
1
Where should the most important KPIs usually be placed on a dashboard?
Anonymous Quiz
6%
A) Bottom
16%
B) Middle
55%
C) Top
23%
D) Side panel only
1
Which of the following is a common dashboard mistake?
Anonymous Quiz
6%
A) Simple layout
12%
B) Clear KPIs
75%
C) Too many visuals
7%
D) Interactive filters
1
What helps users interact with dashboard data?
Anonymous Quiz
11%
A) Variables
5%
B) Loops
70%
C) Slicers and filters
15%
D) SQL joins
1
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4
Excel for Data Analysis 📊📈

👉 Excel is one of the most widely used tools in:

Data Analysis

Business Reporting

Finance

Operations

Even today, Excel is heavily used in companies worldwide.

🔹 1. Why Excel is Important?

Easy to use

Fast data analysis

Great for reporting

Common interview skill

🔥 2. Important Excel Features for Data Analysis

Formulas & Functions

Sorting & Filtering

Conditional Formatting

Pivot Tables

Charts & Dashboards

🔹 3. Basic Formulas

SUM

Adds values.

=SUM(A1:A10)

AVERAGE

Finds average value.

=AVERAGE(A1:A10)

COUNT

Counts numbers.

=COUNT(A1:A10)

MAX & MIN

=MAX(A1:A10)

=MIN(A1:A10)

🔹 4. IF Function

Used for conditions.

=IF(A1>50,"Pass","Fail")

🔹 5. VLOOKUP

Searches for values in tables.

=VLOOKUP(101,A2:D10,2,FALSE)

👉 Very important interview topic.

🔹 6. Pivot Tables

Used for:

Summarizing data

Grouping information

Quick analysis

Example:

👉 Total sales by region.

🔹 7. Conditional Formatting

Highlights important values.

Examples:

High sales → Green

Low sales → Red

🔹 8. Charts in Excel

Popular charts:

Bar Chart

Pie Chart

Line Chart

Combo Chart

🔹 9. Why Excel Still Matters?

Used in almost every company

Important for quick analysis

Frequently asked in interviews

🎯 Today’s Goal

Learn formulas

Understand Pivot Tables

Learn VLOOKUP

Create basic charts

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5
Which Excel function is used to calculate the total of a range of numbers?
Anonymous Quiz
26%
A) COUNT()
15%
B) AVERAGE()
52%
C) SUM()
6%
D) MAX()
1
Which Excel feature is commonly used to summarize large datasets?
Anonymous Quiz
14%
A) Conditional Formatting
23%
B) VLOOKUP
59%
C) Pivot Table
4%
D) Filter
1