Start with reading these interesting notes

[Napodano]

https://pfmboard.com/index.php?topic=9096.0

[John Short]

Some more notes from the IMF.
• fiscal issues
• macro critical structural issues;

Tracking the Economic Impact of COVID-19 and Mitigation Policies in Europe and the United States
Options to Support the Incomes of Informal Workers During COVID-19

• monetary and financial policies;

Regulatory and Supervisory Response to Deal with Coronavirus Impact: Securities Market
Macrofinancial Considerations for Assessing the Impact of the COVID-19 Pandemic
- Debt Management Responses to the Pandemic
- Cybersecurity of Remote Work During Pandemic
- Central Bank Support to Financial Markets in the Coronavirus Pandemic
- Banking Sector Regulatory and Supervisory Response to Deal with Coronavirus Impact (with Q and A)
Impact of COVID-19 on Insurers

• statistical issues;

How to Record Debt Relief under the Catastrophe Containment and Relief Trust in Macroeconomic Statistics; and
Government Support to Business and Households

•  tax law design issues.
Tax Law Design Considerations When Implementing Responses to the COVID-19 Crisis
 

Temporary Investment Incentives
https://www.imf.org/~/media/Files/Publications/covid19-special-notes/en-special-series-on-covid-19-temporary-investment-incentives.ashx?la=en

Temporary investment incentives can provide investment demand stimulus to support economic recovery from the COVID-19 pandemic. This note describes temporary investment tax incentives and reviews their effectiveness.

Managing Public Investment Spending during the Crisis
https://www.imf.org/~/media/Files/Publications/covid19-special-notes/en-special-series-on-covid-19-managing-public-investment-spending-during-the-crisis.ashx?la=en

Managing public investment spending plays a key role in the fiscal response to the COVID-19 pandemic. The note discusses two aspects: cuts or postponements in spending in the initial phase, and the scaling up of spending for economic recovery.

Budget Execution Controls to Mitigate Corruption Risk in Pandemic Spending
https://www.imf.org/~/media/Files/Publications/covid19-special-notes/enspecial-series-on-covid19budget-execution-controls-to-mitigate-corruption-risk-in-pandemic-spendin.ashx?la=en

Ensuring that ramped-up spending in response to COVID-19 is effective requires addressing vulnerabilities to misuse and corruption. This note identifies measures to mitigate such vulnerabilities, with a particular focus on budget execution controls

 
Also World Bank
https://www.worldbank.org/en/who-we-are/news/coronavirus-covid19