What is ETF? Is it worth investing?

Most of you might already know what stocks and funds are. They both have advantages and disadvantage, what will happen if we combine stocks and funds together.
What is a passive and active fund? What is the difference?

Before investing in mutual funds, we must first know what type of fund we are going to invest in. And how do fund managers manage funds?
What are the advantages of e-wallets and what are the cautions?

Every coin has two sides, as do e-wallets and cashless societies. First, let’s see what a cashless society is.