The best group prayer is the group prayer of the Friday prayer, which is obligatory and therefore unlawful to leave without excuse. Next [h: in merit] is the group prayer of the fajr prayer on Friday, followed by the group prayer of the fajr prayer on other days, followed by the group prayer of the ‘isha prayer, followed by the group prayer of the ‘asr prayer, followed by the group prayer of the zuhr prayer, followed by the group prayer of the maghrib prayer (Hashiyat al-Bajuri, 1.123).
Prayer - the second of the 5 Islamic Pillars . The account of your prayer will be the first to be questioned on the day of judgement.
You must be in a " purified state " i.e you must have done your WUDU (or Ghusl if needed). And your attire must be Najis free. See relevant section for details. You must know which actions / recitations are fardh / integral , & which are sunnat / recommended only. And you must know the invalidators.
The " "Reliance of the traveller" translated by Nuh Keller is a detail reference. The translation of "Al Maqasid" is good with an online audio of the relevant recitations available at: RECORDED SUPPLICATIONS
