Signs about the World ending:
People fighting
Earthquakes
Prophet Isa (Jesus) is going to fight the devils before the World ends
The days will be short
إِنَّ ٱلسَّاعَةَ ءَاتِيَةٌ أَكَادُ أُخْفِيهَا لِتُجْزَىٰ كُلُّ نَفْسٍۭ بِمَا تَسْعَىٰ ١٥
The Hour is sure to come. My Will is to keep it hidden, so that every soul may be rewarded according to their efforts. Holy Quran 20:15
What happens if a person dies at the time of the end of the World?
The angels of death start beating the soul and extracts it from the body in a most painful way and you would get tested from 2 angels called Munkar and Nakir under the grave. They will ask. "Who is your Lord?" "What is your religion? "Who is your Prophet?". If you are a Muslim and you have faith in Allah then Allah will be happy and you will get to see Allah (depending on how good you did).
The day of judgement
Allah will decide how people will spend their afterlife. Most Muslims believe they have free will to make their own choices. They also believe that they will be judged by God for those choices.If the deceased answers correctly, the time spent awaiting the resurrection is pleasant and may enter Heaven.If the deceased answers incorrectly, the time spent awaiting the resurrection is pleasant and may enter Hell.
What will happen to the pets in the day of judgement?
All creatures will rise up and have justice for any wrong that was done to them, including animals.Unlike humans who are judged for their good and bad deeds, animals will instead turn to dust when they die.Because animals can't speak in any languages.
Does Allah forgive all sins?
Despair not of the Mercy of Allah: for Allah forgives all sins: for He is Oft-Forgiving, Most Merciful. Again, God says to the believers in a Hadith Qudsi: "O son of Adam, so long as you call upon Me, and ask of Me, I shall forgive you for what you have done, and I shall not mind.
What can you do in Heaven and Hell?
You can ask Allah what ever you want in Heaven . for example, if you want 24k gold you just have to ask Allah then he will give it to you. You can live forever. You can own your dream house. But in Hell nobody will be with you, you will be alone in the blazing fire.Those who has been punished will be struck by angels, drink boiling water, and eat from the tree of Zaqqum, whose fruit is like the heads of devils.
يَـٰٓأَيُّهَا ٱلنَّاسُ إِن كُنتُمْ فِى رَيْبٍۢ مِّنَ ٱلْبَعْثِ فَإِنَّا خَلَقْنَـٰكُم مِّن تُرَابٍۢ ثُمَّ مِن نُّطْفَةٍۢ ثُمَّ مِنْ عَلَقَةٍۢ ثُمَّ مِن مُّضْغَةٍۢ مُّخَلَّقَةٍۢ وَغَيْرِ مُخَلَّقَةٍۢ لِّنُبَيِّنَ لَكُمْ ۚ وَنُقِرُّ فِى ٱلْأَرْحَامِ مَا نَشَآءُ إِلَىٰٓ أَجَلٍۢ مُّسَمًّۭى ثُمَّ نُخْرِجُكُمْ طِفْلًۭا ثُمَّ لِتَبْلُغُوٓا۟ أَشُدَّكُمْ ۖ وَمِنكُم مَّن يُتَوَفَّىٰ وَمِنكُم مَّن يُرَدُّ إِلَىٰٓ أَرْذَلِ ٱلْعُمُرِ لِكَيْلَا يَعْلَمَ مِنۢ بَعْدِ عِلْمٍۢ شَيْـًۭٔا ۚ وَتَرَى ٱلْأَرْضَ هَامِدَةًۭ فَإِذَآ أَنزَلْنَا عَلَيْهَا ٱلْمَآءَ ٱهْتَزَّتْ وَرَبَتْ وَأَنۢبَتَتْ مِن كُلِّ زَوْجٍۭ بَهِيجٍۢ ٥
O humanity! If you are in doubt about the Resurrection, then ˹know that˺ We did create you1 from dust, then from a sperm-drop,2 then ˹developed you into˺ a clinging clot,3 then a lump of flesh fully formed or unformed in order to demonstrate ˹Our power˺ to you. ˹Then˺ We settle whatever ˹embryo˺ We will in the womb for an appointed term, then bring you forth as infants, so that you may reach your prime. Some of you ˹may˺ die ˹young˺, while others are left to reach the most feeble stage of life so that they may know nothing after having known much. And you see the earth lifeless, but as soon as We send down rain upon it, it begins to stir ˹to life˺ and swell, producing every type of pleasant plant. 22:5 Holy Quran
https://quran.com/en link to see more signs about the world ending. Read Surah Al Baqurah to discover more infromation.