Short and Crispy

RSA vs ED25519

TL;DR:

• Use ED25519 (if supported)
• Unless you’re targeting legacy systems, prefer ed25519 — it’s more modern, secure, and faster.
• ED25519: Modern, compact, faster — recommended
• RSA: Widely compatible, older, heavier — use if needed for legacy support

Detailed Comparison

When to Use Each

How to Generate (Examples)

# ED25519
ssh-keygen -t ed25519 -C "[email protected]"

# RSA (4096-bit)
ssh-keygen -t rsa -b 4096 -C "[email protected]"

Managing multiple SSH keys for both GitHub and Bitbucket, each with personal and work accounts

GitHub identifies SSH keys by the email/username attached to the key, so you need to configure them properly

📋 Topics Covered

• The Two Types of Options: Calls vs Puts
• Understanding Spot Price, Strike Price, and Intrinsic Value
• “Moneyness” (ITM, ATM, OTM)
• Option Greeks: Delta, Theta, Vega, and Gamma
• Option Buying vs. Option Selling
• Extrinsic Value and the “Hero or Zero” Effect

📋 Topics Covered

• What is a Futures Contract?
• Who uses Futures and Why?
• The Role of Hedgers
• The Role of Speculators
• The Role of Arbitrageurs

📋 Topics Covered

• The Core Concept of Derivatives
• Differences Between Futures and Options
• Key Terms: Expiry, Strike Price, and MTM
• Margin Requirements for Buyers vs. Sellers
• Contract Expiration Cycles and Rollovers

📋 Topics Covered

• Financial Year (FY) vs. Assessment Year (AY)
• Advance Tax Rules and Due Dates
• Understanding Income Tax Returns (ITR) and Why You Should File
• 5 Major Heads of Income
• Which ITR Form to File (ITR-1 to ITR-4 breakdown)
• Important Documents: Form 26AS, AIS, and TIS

📋 Topics Covered

• Introduction to Tax Planning (Salaried vs. Business)
• Overview of Section 44ADA (Presumptive Taxation for Professionals)
• Breakdown of Section 44AD (Presumptive Taxation for Businesses)

📋 Topics Covered

• Introduction to Business Entities in India
• Sole Proprietorship (Features, Taxation, Compliance, Pros & Cons)
• Partnership Firm
• Private Limited Company (Pvt. Ltd.)
• Limited Liability Partnership (LLP)
• One Person Company (OPC)
• Hindu Undivided Family (HUF) & Tax Saving Benefits

📋 Topics Covered

• Introduction to Cash Flow (CF) Statement
• P&L vs. Cash Flow differences
• Components of Net Cash Balance (CFO, CFI, CFF)
• Defining Free Cash Flow (FCF)
• Financial Result Timelines and Annual Reports

📋 Topics Covered

• General Terms Used in Financial Ratios
• Profitability Ratios (PAT, EBIT, EBITDA Margins)
• Return Ratios (ROE, ROCE, ROA)
• Leverage Ratios (D/E, Interest Coverage)
• Valuation Ratios (P/E, P/B, PEG)

📋 Topics Covered

• Introduction to Profit and Loss (P&L) Statement
• Understanding Income (Operating Revenue vs. Other Income)
• Breakdown of Expenses (Material Costs, Depreciation, Amortization, etc.)
• Types of Expenditure (Capital vs. Revenue)