When we hear the term "marriage," various people have different ideas in their heads. Happy, excited, nervous, tense, shy, nervous, depressed, tired, and full of other emotions. In India, the word "marriage" might occasionally make us feel under pressure. That shouldn't be the case, in my opinion; it shouldn't be similar to looking for an unpaid employee or an ATM that is only used to withdraw cash.

It's true but unacceptable that Some men and women enter into marriage without a plan as a result of pressure from their families, advancing age, or as a way for society to avoid uncomfortable questions. So their is no understanding or mutual love or acceptance for their partners.

No proper planning before marriage.

Ego clash from any one side or both side 

Not spending enough time with each other

Not trying to sort out the issues between them on the same day

Disrespecting  or insulting partners or their family members infront of others

Under estimating partners knowledge

Not taking proper care for their health and needs

This seems to be a very simple point while reading for a person who  has not entered into a marriage life.

Try to spend quality time with the partner without any gadgets.

Let it be a simple thing praise them or thank them, which gives a smile in their face

Treat their family as your family too

A hug a simple hug which has a bundle of happiness

Discuss the issues and sort it out before going to bed and start a fresh day

We should understand our partners situation, each day wont be same as the previous, understand your partner and support them

Your partner should believe you, and be with you

Even in love marriage there is problems, when we are in love we would like to show them only our sweet part of character, we are afraid to show them our anger face side, afraid to lose them, spendind a lot of time with them, missing them, chatting, dating, outing, gifting and lots. But when they enter in marriage its not like that. They handle the presure of life so one day or the other they burst out.

It all comes down to communication; having good communication is essential to having a successful relationship. A couple will be well on their way to a happier marriage when both partners can accept accountability for their attitudes and actions, instead of escalating into an argument and using derogatory language. 
It's crucial to keep in mind that all couples have arguments. While arguments are a natural part of marriage, they don't have to be damaging or destroy your bond. Numerous couples have discovered that The Marriage Playbook enhances communication and provides practical measures to guarantee that partners argue amicably and forge a more robust marriage.

Both come from different family and different situation, adapting a new place and a new situation takes time.