Some orders are very easy in order to perform; You are obeying once you know this order.
I. I found first one in Surah Al-Baqarah 2:104 لا تَقُولُوا رَاعِنَا وَقُولُوا انظُرْنَا وَاسْمَعُوا "say not (to the Apostle) words of ambiguous import but words of respect;". If you are non-arabic speaking then you are already obeying this because Allah says don't use word رَاعِنَا but use انظُرْنَا in order to say "we have seen".
Because Jews were used to change characters towards the bad. Likewise one Jew was said to prophet Muhammad (pbuh) "Samu Alaikum" word "Samu" means death. Also Allah has quoted in Quran that وَقُولُوا حِطَّةٌ but they changed with others. (2:58)
II. You may have noticed that the longest verse in the Quran starts with same address about finance & lend. (2:282)
III. Quran contains 86 verses in which Allah addressing you directly for giving an order to the believers.
All of these verses starts with يَا أَيُّهَا الَّذِينَ آمَنُوا except one verse 33:56 in which Allah not only giving you an order but also Allah Subhanahu & Angels are doing the same.
إِنَّ اللهَ وَمَلائِكَتَهُ يُصَلُّونَ عَلَى النَّبِيِّ يَا أَيُّهَا الَّذِينَ آمَنُوا صَلُّوا عَلَيْهِ وَسَلِّمُوا تَسْلِيماً
"Allah and His angels send blessings on the Prophet: O ye that believe! send ye blessings on him and salute him with all respect."
IV. In the last verse Allah ordering for Repentance تُوبُوا إِلَى اللهِ تَوْبَةً نَصُوحاً "turn to Allah with sincere repentance: " (66:8)
V. Before the last there is three verses for the awareness from families and children.