W-2 and 1099 Income Management

I have income from multiple sources including W-2 employment and 1099 work. Help me understand how to manage this for taxes.

My income sources:
- W-2 employer(s): [Number and approximate income from each]
- 1099-NEC (freelance/contract work): [Yes/No - Amount]
- 1099-MISC: [Yes/No - Amount]
- 1099-INT (interest): [Yes/No - Amount]
- 1099-DIV (dividends): [Yes/No - Amount]
- 1099-B (investment sales): [Yes/No - Amount]
- 1099-K (payment platforms): [Yes/No - Amount]
- Other income: [Describe]

Please explain:
1. How each income type is taxed differently
2. Withholding strategies for W-2 income
3. Estimated tax requirements for 1099 income
4. How to reconcile 1099-K with actual income
5. Deductions specific to 1099 income
6. Common mistakes to avoid
7. Organization system for tracking multiple income sources