DPSP’s are very important, and every year 1 or 2 questions come in Civil Services preliminary examination from them. So, just go through these facts and try to remember them. 

Classification Of The Directive Principles:

Four categories are:
I. The economic and social principles
II. The Gandhian principles
III. Principles and Policies relating to international peace and security
IV Miscellaneous

The economic and social Principles:
The state shall endeavour to achieve Social and Economic welfare of the people by:
(1) providing adequate means of livelihood for both men and women. (Article 39 basically which has this above sentence specifically given, and this is also related to Article 41 Adequate work and 43 Living wages)
(2) reorganizing the economic system in a way to avoid concentration of wealth in few
hands. (Article 38 – securing social order and economic justice)
(3) securing equal pay for equal work for both men and women. ( Article 39)
(4) securing suitable employment and healthy working conditions for men, women and
children. ( Article 47 ) 
(5) guarding the children against exploitation and moral degradation. (Article 39) 
(6) making effective provisions for securing the right to work, education and public
assistance in case of unemployment, old age, sickness and disablement. ( Article 41)
(7) making provisions for securing just and humane conditions of work and for maternity
relief. ( Article 42) 
(8) taking steps to secure the participation of workers in the management of undertakings
etc. (Article 43A – 42nd Amendment Act)
(9) promoting education and economic interests of working sections of the people
especially the SCs and STs. ( Article 46) 
(10) securing for all the workers reasonable leisure and cultural opportunities. (Article 43)
(11) making efforts to raise the standard of living and public health. (Article 47) 
(12) providing early childhood care and education to all children until they complete the
age of 6 years. (Article 45) 

B. The Gandhian Principles :
(1) To organize village Panchayats. (Article 40)
(2) To promote cottage industries in rural areas. (Article 43)
(3) To prohibit intoxicating drinks and drugs that are injurious to health. (Article 47)
(4) To preserve and improve the breeds of the cattle and prohibit slaughter of cows,
calves and other milch and drought animals. (Article 48) 

C. DPSP relating To International Peace And Security:
India should render active cooperation for world peace and security and for that the state
shall endeavour to : – (All the below Article 51)
(1) promote international peace and security. 
(2) maintain just and honourable relations between nations.
(3) foster respect for international laws and treaty obligations.
(4) encourage settlements of international disputes by mutual agreement.

D. Miscellaneous
The Directive Principles in this category call upon the state : –
(1) To secure for all Indians a uniform civil code. (Article 44)
(2) To protect historical monuments. ( Article 49)
(3) To save environment from pollution and protect wild life. (Article 48A – introduced by 42nd Amendment Act)

(4) To make arrangements for disbursement of free legal justice through suitable
legislation. ( Article 39A – 42nd amendment act)