Salaams. What is the best way to know Allah (SWT)? What (free and paid) sources would you recommend for studying His 99 Names?

بَلْ كَذَّبُوا۟ بِمَا لَمْ يُحِيطُوا۟ بِعِلْمِهِۦ وَلَمَّا يَأْتِهِمْ تَأْوِيلُهُۥ ۚ كَذَٰلِكَ كَذَّبَ ٱلَّذِينَ مِن قَبْلِهِمْ ۖ فَٱنظُرْ كَيْفَ كَانَ عَٰقِبَةُ ٱلظَّٰلِمِينَ﴾ وفي هذا دليل على التثبت في الأمور، وأنه لا ينبغي للإنسان أن يبادر بقبول شيء، أو رده قبل أن يحيط به علماً. [السعدي:٣٦٥] “Rather, they denied what they did not fully comprehend and had not yet received its explanation. Thus did those before them deny, so see how the end of the wrongdoers was.” [Surah Yunus 10:39] And in this is a proof for verifying matters carefully, showing that a person should not rush to accept or reject something before having full knowledge of it. [As-Sa‘di, 365]