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First, what is a User Story in Agile? User Story, the shortest work in an Agile Framework. It's an ultimate objective, not an element, communicated from the product users point of view. A User Story is a casual, general clarification of a product highlight composed according to the point of view of the User client or client.  

5 top most advantages of User Story: 

Reinforcing The Agile Manifesto- User stories straightforwardly support the Agile manifesto. Clearly, user stories support zeroing in on working programming over far-reaching documentation. The discussion upholds people and corporations and client joint effort, and the curtness and an undeniable level of a user story upholds reacting to change as we draw nearer to execution. 

Betterment in Verbal Communication- User stories likewise underline verbal as opposed to composed correspondence. They support discussion, eye to eye conversations instead of record handoffs.

Postponement in Details- User stories support conceding subtleties until one has a superior comprehension concerning what one truly needs. This stays away from pointless definite arranging which may change when one arrives at advancement time. 

Reinforce in Product Backlog Refinement- User stories give the right size to arranging. Their undeniable level, with attention on esteem, makes it simple to focus on and once again request the Product Backlog Refinement. 

Easy to understand- User Stories are written in business terms and not the specialized language which makes them conceivable by the two Users and Development Team.

Ease in Sprint- User stories begin at the expansive, significant level, and coarse-grained. By means of a few Sprints, they get increasingly refined and itemized as we draw nearer to execution.  

Note- Powerful User Stories by making straightforwardness, further developing cooperation, making mutual perspective and arranging the groups to zero in on client needs, dispenses with different potential dangers, for example, - absence of correspondence hazard, specialized danger, monetary danger, business hazard, and so on. 

Investment in User Story: 

The word ‘INVEST’ here stands for-

• Independent – One Story must not be dependent on another.
• Negotiable – Stories should catch the substance of the prerequisite and ought not address an agreement on the most proficient method to tackle it. 
• Valuable –A story ought to offer some incentive to the client or the client. On the off chance that a client can't imagine a worth assertion, maybe we should de-focus on the story, or possibly the work is pointless, and we ought to dispense with it by and large.
• Estimable – Stories ought to give barely sufficient data so they can be assessed. Know the specific way that a specific issue will be settled. It should just be seen enough to give a significant level gauge.
• Small-Stories ought to endeavor to be granular enough in scope that they might be finished in as brief a period as could be expected, from a couple a long time to a couple of days.
• Testable- Stories ought to be testable to assist with deciding culmination. A story ought to have acknowledgment rules. The acknowledgment measures ought to be level headed. Try not to utilize models like simple to utilize, quick or bug free. Attempt to compose standards that can be estimated and tried (unmistakably robotized). For instance, test that installment confirmation reacts in 1 second or less basically 95% of the time.

Three C’s in User Story:

Card- Composed portrayal of the story utilized for arranging and assessment. 

Conversation- The Conversation is important to get further insights concerning the Card. The conversation advances the gradual and persistent coordinated effort among the light-footed group expected to fabricate a mutual perspective around the issue and likely arrangement. 

Confirmation- Confirmation is the acknowledgment model which catches the fundamental prerequisites and makes an interpretation of them into the test measures with the goal that we realize when we've effectively conveyed the client story.  

The correct User Story:

Product Backlog Items (PBIs) or user stories ought to be little. Little stories give concentration to the team and give individuals the adaptability to change and adjust to changes. The bigger the story, the higher the danger of Scrum Team individuals becoming mixed up in the subtleties and making bottlenecks as individuals are occupied and inaccessible to collaborate and help different teammates. This builds the danger of arriving at the finish of the Sprint with a great deal of PBIs still in progress and neglecting to deliver a quality Product Increment. 

Top 3 reasons to Split a User Story: 

Size- Huge user stories need further refinement to separate them into more sensible pieces. Key indicators that a user story is too huge are if the gauge is more prominent than the Sprint length. 

Dependency- Stories that rely upon one another make assessment troublesome and yet again ordering the Product Backlog Refinement harder. The story should be parted where one story handles the reliance and the others handle the points of interest.

Risk- Stories that are intricate and unsafe are possibilities for additional refinement utilizing spikes to acquire a superior comprehension of the issue and find methods of separating the story into less complicated parts. A key indicator that a user story is difficult is if the Scrum Team is experiencing issues giving a gauge.

Conclusion

User stories are a famous method of portraying build-up work things for programming applications. You can utilize the INVEST abbreviation mental helper to recall the most significant qualities of good user stories. Great user stories are little and free, which assists them with moving through the work interaction. They're significant to end-users, and preferably ought to be testable so you know with certainty that they're done and working appropriately when conveyed. They're admirable, or they're little enough that you don't have to gauge them, and they're debatable, which means they're not settled as composed. They're intended to give a fundamental structure to a discussion with the client, and that discussion will give the designer what they need to know to execute the story. 

References

1. Top 3 Reasons to Split a User Story – Kaizenko
2. The 6 Attributes of Effective User Stories – INVEST – Kaizenko
3. User stories