Messenger of Allah ﷺ said, "Whoever does not recite Al-Fatiha in his prayer, his prayer is invalid."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ صَلاَةَ لِمَنْ لَمْ يَقْرَأْ بِفَاتِحَةِ الْكِتَابِ  

The Qur'an is recited in every prayer and in those prayers in which Messenger of Allah ﷺ recited aloud for us, we recite aloud in the same prayers for you; and the prayers in which the Prophet ﷺ recited quietly, we recite quietly. If you recite "Al-Fatiha" only it is sufficient but if you recite something else in addition, it is better.  

أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ ؓ يَقُولُ فِي كُلِّ صَلاَةٍ يُقْرَأُ فَمَا أَسْمَعَنَا رَسُولُ اللَّهِ ﷺ أَسْمَعْنَاكُمْ وَمَا أَخْفَى عَنَّا أَخْفَيْنَا عَنْكُمْ وَإِنْ لَمْ تَزِدْ عَلَى أُمِّ الْقُرْآنِ أَجْزَأَتْ وَإِنْ زِدْتَ فَهُوَ خَيْرٌ  

Once the Prophet ﷺ entered the mosque, a man came in, offered the prayer and greeted the Prophet. The Prophet returned his greeting and said to him, "Go back and pray again for you have not prayed." The man offered the prayer again, came back and greeted the Prophet. He said to him thrice, "Go back and pray again for you have not prayed." The man said, "By Him Who has sent you with the truth! I do not know a better way of praying. Kindly teach Me how to pray." He said, "When you stand for the prayer, say Takbir and then recite from the Qur'an what you know and then bow with calmness till you feel at ease, then rise from bowing till you stand straight. Afterwards prostrate calmly till you feel at ease and then raise (your head) and sit with Calmness till you feel at ease and then prostrate with calmness till you feel at ease in prostration and do the same in the whole of your prayer."  

أَنَّ النَّبِيَّ ﷺ دَخَلَ الْمَسْجِدَ فَدَخَلَ رَجُلٌ فَصَلَّى ثُمَّ جَاءَ فَسَلَّمَ عَلَى النَّبِيِّ ﷺ فَرَدَّ النَّبِيُّ ﷺ عَلَيْهِ السَّلاَمَ فَقَالَ ارْجِعْ فَصَلِّ فَإِنَّكَ لَمْ تُصَلِّ فَصَلَّى ثُمَّ جَاءَ فَسَلَّمَ عَلَى النَّبِيِّ ﷺ فَقَالَ ارْجِعْ فَصَلِّ فَإِنَّكَ لَمْ تُصَلِّ ثَلاَثًا فَقَالَ وَالَّذِي بَعَثَكَ بِالْحَقِّ فَمَا أُحْسِنُ غَيْرَهُ فَعَلِّمْنِي قَالَ إِذَا قُمْتَ إِلَى الصَّلاَةِ فَكَبِّرْ ثُمَّ اقْرَأْ مَا تَيَسَّرَ مَعَكَ مِنَ الْقُرْآنِ ثُمَّ ارْكَعْ حَتَّى تَطْمَئِنَّ رَاكِعًا ثُمَّ ارْفَعْ حَتَّى تَعْتَدِلَ قَائِمًا ثُمَّ اسْجُدْ حَتَّى تَطْمَئِنَّ سَاجِدًا ثُمَّ ارْفَعْ حَتَّى تَطْمَئِنَّ جَالِسًا ثُمَّ اسْجُدْ حَتَّى تَطْمَئِنَّ سَاجِدًا ثُمَّ افْعَلْ ذَلِكَ فِي صَلاَتِكَ كُلِّهَا