Bismillah.
After we finish making a Du’a to Allah (SWT) asking him to guide us, He answers us with the Qur’an. He begins his answer with Surah Baqarah, and with three miraculous letters:

From the beginning, Allah shows us that we have such limited knowledge. We know so little, yet we think we know so much. If we know so much, we should be able to interpret these letters, but because we do not know anything, we are not able to.

This is the Book about which there is no doubt, a guidance for those conscious of Allah–
Allah (SWT) then states such a strong statement. He says that this book, this Qur’an has absolutely no doubt in it, there is nothing wrong it in, there is no mistake in it, and it is all true. This Qur’an, as we keep reading it will clear up all the misconceptions we might have. But who is this book for, who will benefit from this book? The Mutaqeeen. Naturally the next question in our head will be who are these people, how can I be one of them. And Subhanallah, the Qur’an does answer all our questions. In the next Ayat Allah mentions who these people are.

Who believe in the unseen, establish prayer, and spend out of what We have provided for them,
They believe in the Ghaib, those things we cannot see. But why should we believe in something we can’t see? If Allah (SWT) showed us heaven and hell in front of us, would we hesitate to worship Him? No, we wouldn’t care about anyone but do what we had to in order to get to Heaven. But the test comes when we can’t see it. These people then show that they believe in the unseen by establishing salah. Establishing salah is not praying salah sometimes, but establishing it, meaning making it regular and proper with total submission. They give their rights to Allah (SWT), and to others. They give to others from what they have been provided with, whether it is food, money, clothes, time, knowledge, and talents, anything they were given by Allah (SWT).

And who believe in what has been revealed to you, [O Muúammad], and what was revealed before you, and of the Hereafter they are certain [in faith].
These people also accept the Qur’an and the Sunnah/Hadith that was given to the Prophet (S). They also accept the previous prophets and the previous books such as Jesus (A) and the Injil and Musa (A) and the Torah. And last quality, they believe in the Akhirah with certainty. Allah (SWT) doesn’t say they believe in it, but they believe in it with certainty, they have strong conviction of it, it’s almost as though they can see it.

Those are upon [right] guidance from their Lord, and it is those who are the successful.
These people, that have these qualities are successful. The Arabic word for success comes from the root which means farmer. For a farmer, when is he successful? After he seeds the earth, takes care of it daily, working day and night, and then after a while when the fruits grow and he sells them, that is when he makes money and is successful. His success is not instant gratification. Just like that, we need to work hard, day and night, and then after we work and put in some labor will we get success.

Indeed, those who disbelieve – it is all the same for them whether you warn them or do not warn them – they will not believe.
And then Allah (SWT) shows us the other extreme, the disbelievers. For them, no matter how much you warn them, they don’t want to listen, they don’t care. They are having too much fun in this world and are too used to the easy life. They don’t want to sacrifice anything. They don’t want to change. So you tell them or not, it’s as if they never heard

Allāh has set a seal upon their hearts and upon their hearing, and over their vision is a veil. And for them is a great punishment.
They are given the Qur’an, they are given the guidance, but they choose the dunya over the akhira. They choose to have a fun life now rather than later. Because of their choice, Allah (SWT) seals their hearts, their hearings, and their sight has a veil. These are the faculties to help you identify the truth, and these faculties are no longer available. They are blinded by their desires, by the “fun” entertainment. They can’t see the truth nor hear it because they don’t want to hear it. They can’t recognize the truth because their hearts are already occupied with the dunya. And their punishment doesn’t end there, they have a painful punishment in the akhira.
Allah shows us 2 out of 3 groups of mankind. 1-beleivers, 2-disbelievers, 3-hypocrites. Inshallah in the following ayat Allah (SWT) mentions the 3rd group and leaves the choice to us, pick who you want to be like, there is no midway.