Planck's constant, basic understanding help

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Planck's constant, valued at 6.63 x 10^-34, is derived from experimental measurements and is essential for the equation E=hf, where E represents energy, h is Planck's constant, and f is frequency. This constant quantifies the energy of a quantum or "packet" of energy, linking energy and frequency in quantum physics. Understanding its origin involves recognizing that it is a fundamental aspect of quantum mechanics rather than a derived value from other constants. The confusion often arises from its abstract nature and the transition from classical to quantum physics. Grasping Planck's constant is crucial for deeper studies in quantum mechanics.
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I'm currently a GCSE candidate but i am reading books on quantum physics as i intend on studying it for A level. I'm slightly confused on Plancks constant. I don't understand where the value of 6.63*10^-34 comes from, and i don't understand what it represents, if that actually makes sense.

I undertsnad the equation

E=hf

is used where h is Planks constant and is used to work the energy of a quantum or 'packet' of energy, but again don't understand how it has come about and don't understand what it is supposed to be.

Sorry if this sounds very amateurish but we all have to start somewhere, the help would be appreciated.
 
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Planck's constant is obtained by experimental measurement. It is no more or less than the constant needed for E=hf.
 

Thread 'Two equivalent statements of time reversal symmetric Hamiltonian'

Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?
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