Hi there,
Great question!
My best recommendation is that you start reading more. The Financial Times, The Economist, etc. The more you read, the more you'll get a sense for numbers.
In terms of helping you ASAP, however, I highly recommend you lookup references. Some key examples I can think of include:
- Country populations
- Household incomes across rich, middle income, and poor countries (and segments of society)
- Demographic details
- Size of major industries (in your home country)
- "Random" facts, such as:
- Annual per capita spend on clothes
- Annual consumption per capita of x food item
- Etc.
I have a market sizing presentation + supporting materials. Shoot me a message and I'm happy to take you through this! (Includes a thorough breakdown of some of the key numbers to learn)