Government spending in normal times is largely to meet demand and typically accounts for around one-third of a country's economy. With Covid, the response has led to unprecedented global borrowing.
What matters is that the level of borrowing is controlled so that people continue to have confidence that government debts will always be repaid. Governments can issue their own money, either by printing it or by creating it electronically. However, creating money in this way creates a risk. Since money depends on trust, when a government issues an increasing amount of currency, people may have less confidence in the value of that currency. If their trust collapses completely, then hyperinflation may occur, as happened in Germany in the 1920s.