The Constitution of India sets the principle qualifications one must meet to be eligible to the office of the chief minister. A chief minister must be:
a citizen of India.
should be a member of the state legislature. If a person is elected chief minister who is not a member of the legislature, then he/she must take sign from governor.
An individual who is not a member of the legislature can be considered as the chief minister provided he/she gets himself/herself elected to the State Legislature within six months from the date of their appointment. Failing which, he/she would cease to be the chief minister.
Election
The chief minister is elected through a majority in the state legislative assembly. This is procedurally established by the vote of confidence in the legislative assembly, as suggested by the governor of the state who is the appointing authority. They are elected for five years. The chief minister shall hold office during the pleasure of the governor.
Oath
Since, according to the constitution, the chief minister is appointed by the governor, the swearing in is done before the governor of the state. The oath of office. The oath of secrecy
Resignation
In the event of a Chief Minister's resignation, which conventionally occurs after a general election or during a phase of assembly majority transition, the outgoing Chief minister holds the informal title of "caretaker" chief minister until the Governor either appoints a new chief minister or dissolves the assembly. Since the post is not constitutionally defined, the caretaker chief minister enjoys all the powers a regular chief minister, but cannot to make any major policy decisions or cabinet changes during his/her short tenure as caretaker.
Remuneration
By Article 164 of the constitution of India, remuneration of the chief minister as well as other ministers are to be decided by the respective state legislatures. Until the legislature of the state decides salary, it shall be as specified in the second schedule. The salaries thus vary from state to state. As of 2019, the highest salary is drawn by chief ministers of Telangana, which is and lowest by the chief ministers of Tripura which is legally.
Deputy chief minister
Various states throughout the history have appointed Deputy Chief Ministers. Despite being not mentioned in the constitution or law, the Deputy-Chief minister office is often used to pacify factions within the party or coalition. It is similar to the rarely used Deputy-Prime minister post in Central government of India. During the absence of the Chief minister, the deputy-CM may chair cabinet meetings and lead the Assembly majority. Various deputy chief ministers have also taken the oath of secrecy in line with the one that chief minister takes. This oath has also sparked controversies.