Bubbles will burst, you should be cautious

i. What is a stock market bubble:
A stock market bubble is a type of economic bubble taking place in stock markets when market participants drive stock prices above their value in relation to some system of stock valuation.

ii. Causes of bubble:
Emotional and cognitive biases seem to be the causes of bubbles, however, when the phenomenon appears, many try to find a rationale, thereby alluring other investors which further provide buoyancy to the price.

iii. Play safe:
It is seen that asset prices fall rapidly afterwards where asset prices rapidly spike upwards far beyond what could be considered the rational economic value. Thus, one should always be careful while investing and time the entry and exit well.