With the help of CONCATENATE function or Ampersand Operator(&).
COUNT() is used to count cells containing numeric values, dates, etc. ,it can count numeric values except blanks. COUNTA() counts all the values whther they are nbumeric,text,dates etc excluding blanks.The A in COUNTA refers to All. COUNTBLANK counts all blank cells as the name suggests. COUNTIF and COUNTIFS count cells with matching criteria,e.g. cells with value "Apple".
A formula that either directly or indirectly refer to itself is known as circular reference in excel.
Substitute function in excel provides substitute for an instance of text, consider this as a translator which translates a particular value with another value.It works on the basis of value. Syntax-SUBSTITUTE(text, oldText, newText, [instanceNumber]). Replace function swaps a string or part of a string with another string based on the position. Syntax-REPLACE(oldText, startNumber, NumberOfCharacters, newText).
INT function in excel removes fraction part and returns integer. e.g.INT(143.23) will return 143.
Automatically calculates the result if some values involved in the calculation change or replaced. Makes complex calculation easy once we write formula for that.