Hamiltonian and Lagrangian Mechanics: Online Resource

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Several users recommend online resources for studying Lagrangian and Hamiltonian mechanics, highlighting a Harvard course website as particularly useful. The main link provided includes lecture notes that are accessible yet not overly simplistic. Additional resources, such as a PDF handout and a website focused on the principle of least action, are also suggested. These materials cater to those with a basic understanding of the subject looking to deepen their knowledge. Overall, the discussion emphasizes the value of these resources for learning advanced mechanics concepts.
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Does anyone know of a good online resource on Lagrangian and Hamiltonian mechanics?
 
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