The prophet peace be upon him never laughed loudly with his mouth open.
He also never yawned. If we feel the need to yawn, we may do so but we should cover our mouths our left hands. If you need to yawn in salah, then put your top teeth on your bottom lip to stop yourself yawning.
The prophet peace be upon him would always meet people with a happy countenance.
The prophet peace be upon him was always fearful, but he still met people with a happy countenance.
We should be fearful, this will help us prepare for the hereafter and stop us wasting time.
We should also eat and be happy with others etc, but we shouldn't waste our time.
The time of the world is very short, but is very precious, more than the hereafter. Because if we say SubhanAllah in this world we will be rewarded.
When someone goes to a shopping mall, a rich person can buy everything. But a poor person may feel upset that he can't buy anything, he may even regret not spending his free time earning money. This is the time to earn for the hereafter
Whichever durood is the easiest for you to pray, you should pray that. You will be rewarded for it.
Jaabir ibn Samurah radiyallahu anhu says, “The calf of the leg of Rasoolullah sallallahu alaihe wasallam was slightly thin. His laugh was only that of a smile. Whenever I visited Rasoolullah sallallahu alaihe wasallam, I thought he used kuhl on his eyes. Whereas he had not at that time used kuhl.
This is the beauty of the prophet peace be upon him.
Jabir ibn Abdullah radiyallahu anhu says, “After I accepted Islam, Rasoolullah sallallahu alaihe wasallam never prohibited me from attending his assemblies. Whenever he saw me he laughed.” In the second narration it is stated that he smiled.
وَمَا أَرْسَلْنَاكَ إِلَّا رَحْمَةً لِّلْعَالَمِينَ
And We have sent you (O Muhammad صلى الله عليه وسلم): not but as a mercy for the 'Alamin (mankind, jinn and all that exists).
Make sure you have mamoolaat (prayers recited during the day as part of your routine)
Pray Surah Waaqiah daily. You will see the barakah in your wealth.
Pray Surah Mulk. It will aid you in the grave.
There are some duas whose benefit will be felt in the hereafter.
for example, sayyidul istighfaar
"If somebody recites it during the day with firm faith in it and dies on the same day before the evening, he will be from the people of Paradise and if somebody recites it at night with firm faith in it and dies before the morning he will be from the people of Paradise."