Yesterday you said, or you are getting ready to say, that there is no god but Allah. So it is fair to ask, gently and without any shame: who is He? You are allowed to ask. Wanting to know the One you are turning toward is the beginning of loving Him.
You will not learn all of Him in a day, or in a lifetime. No one does. But you can meet Him today, the way you meet anyone, by learning a little of what He is like. Let us start there, slowly.
Just for today
Wherever you are, set down whatever is in your hands for a moment and say, quietly, 'Ya Allah.' That is all. It means 'O Allah,' and it is the oldest way a human heart has ever reached for Him. You do not need the right words yet. He already hears you.
He is One, and that changes everything
قُلْ هُوَ ٱللَّهُ أَحَدٌ ٱللَّهُ ٱلصَّمَدُ لَمْ يَلِدْ وَلَمْ يُولَدْ وَلَمْ يَكُن لَّهُۥ كُفُوًا أَحَدٌۢ
“Say, 'He is Allah, who is One, Allah, the Eternal Refuge. He neither begets nor is born, nor is there to Him any equivalent.'”
Al-Ikhlas 112:1-4 Read 112:1 with tafsir
The first thing to know is the thing you already said: He is One. Not one among many, not the strongest of several gods. One, alone, with no partner, no rival, no equal. This is called tawhid, which means making God one, and it is the ground the whole religion stands on.
Allah is His name, the name He calls Himself in the Qur'an. It is not a foreign word for a foreign god. It is the name the Prophets all the way back called the one Creator: Adam, Ibrahim, Musa, and Isa (Abraham, Moses, and Jesus, peace be upon them). When you say 'Allah,' you are calling Him by His own name.
He described Himself in four short lines, a whole surah, a chapter of the Qur'an, given so that you would never be confused about who He is:
Nothing you can imagine is Him
لَيْسَ كَمِثْلِهِۦ شَىْءٌ ۖ وَهُوَ ٱلسَّمِيعُ ٱلْبَصِيرُ
“There is nothing like unto Him, and He is the Hearing, the Seeing.”
Ash-Shura 42:11 Read 42:11 with tafsir
Here is a relief for your mind. You do not have to picture Him, and you should not try. He is not an old man in the sky, not a light, not a shape, not anything your eyes have ever seen or your mind can draw. Every picture you could make would be too small.
The Qur'an gives you one clean rule that frees you from all of that:
He is closer than you think
وَلَقَدْ خَلَقْنَا ٱلْإِنسَٰنَ وَنَعْلَمُ مَا تُوَسْوِسُ بِهِۦ نَفْسُهُۥ ۖ وَنَحْنُ أَقْرَبُ إِلَيْهِ مِنْ حَبْلِ ٱلْوَرِيدِ
“And We have already created man and know what his soul whispers to him, and We are closer to him than his jugular vein.”
Qaf 50:16 Read 50:16 with tafsir
People sometimes imagine God as distant and uninvolved, too far away to notice them. The Qur'an gently corrects that. He made you, and He is never unaware of you: nearer to you, in His knowledge and His care, than the people in the room, nearer than your own pulse:
He is more merciful than you have been told
Maybe you grew up afraid of God, or were taught He is mostly angry, mostly counting your faults. Set that down. The Qur'an opens, and nearly every one of its chapters opens, with two of His names said together: Ar-Rahman, Ar-Rahim, the Entirely Merciful, the Especially Merciful. Mercy is the first thing He tells you about Himself.
The Prophet ﷺ once watched a mother find her lost child in a crowd, snatch him up, and hold him to her chest. He asked the people around him whether they thought this mother would ever throw her own child into a fire. Never, they said. And he told them:
You can meet Him name by name
That is the One you have turned toward: One, like nothing else, nearer than your heartbeat, and gentler than you were led to believe. You do not have to grasp all of Him at once. He let Himself be known in pieces, through His beautiful names, each one a door you can walk through when you are ready.
There is the Merciful, and the Forgiving, and the Provider, and the Near who answers. When your heart wants more of Him, that is where you go, one name at a time. For today, it is enough simply to know that the One you called upon is good, and close, and listening.