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Photosynthesis
https://www.youtube.com/watch?v=yHVhM-pLRXk
https://www.youtube.com/watch?v=CYw_GfI9nYU
Mechanism
https://www.youtube.com/watch?v=KfvYQgT2M-k
Light Reaction
https://www.youtube.com/watch?v=u3vD9GHEDI8
Dark Reaction
https://www.youtube.com/watch?v=MPXimHmvppQ

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PHOTOSYNTHESIS Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water. This glucose can be converted into pyruvate which releases adenosine triphosphate (ATP) by cellular respiration. Oxygen is also formed. 

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PHOTOSYNTHESIS Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water. This glucose can be converted into pyruvate which releases adenosine triphosphate (ATP) by cellular respiration. Oxygen is also formed. 

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https://www.rsc.org/Education/Teachers/Resources/cfb/Photosynthesis.htm
https://www.livescience.com/51720-photosynthesis.html

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The process of decomposition of water into hydrogen and oxygen by light energy absorbed by chlorophyll is called photolysis. The oxygen produced by the photolysis of water is released into the air as a byproduct of photosynthesis. It should be noted that oxygen released during photosynthesis comes from water.
http://www.funscience.in/study-zone/Biology/Nutrition/MechanismOfPhotosynthesis.php#sthash.8L78b7fw.dpbs
The process of photosynthesis can be divided into two main phases:

1. Light reaction (or light dependent reaction)

2. Dark reaction (or light independent reaction)

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It occurs in the grana present in chloroplast. During light reaction, chlorophyll absorbs light energy in the form of photons. Actually, light is emitted in the form of ‘packets of energy’ called photons. The light energy absorbed by chlorophyll is used to do following reactions:
1. Formation of ATP
ATP is the main energy source of a cell. Its full form is Adenosine Tri Phosphate. A molecule of ATP is formed by combining inorganic phosphate with ADP (Adenosine DiPhosphate) in the presence of energy.
This ATP is used as a source of energy during dark reaction.
2. Photolysis of water
The process of decomposition of water into hydrogen and oxygen by light energy absorbed by chlorophyll is called photolysis. The oxygen produced by the photolysis of water is released into the air as a byproduct of photosynthesis.
3. Formation of NADPH (reduced Nicotinamide Adenine Dinucleotide Phosphate)
The hydrogen ions (H⁺) released during second reaction reduces the NADP (Nicotinamide Adenine Dinucleotide Phosphate) into NADPH in the presence of energy. NADPH is also used during dark reaction.
http://www.funscience.in/study-zone/Biology/Nutrition/MechanismOfPhotosynthesis.php#sthash.8L78b7fw.dpbs

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Dark reactions (light independent reactions)
In dark reactions, the ATP molecule and NADPH produced during light reaction, are used in the matrix (or stroma) of chloroplast to make carbohydrates from carbon dioxide. In this process, carbon dioxide enters into a cycle of reactions in the presence of a substance called RuDP (Ribulose DiPhosphate) and enzymes. At the end of the cycle, carbohydrate is synthesized and ribulose diphosphate is regenerated.
This cycle of reactions is called Calvin-Benson cycle because it was discovered by Melvin Calvin and Andy Benson.
http://www.funscience.in/study-zone/Biology/Nutrition/MechanismOfPhotosynthesis.php#sthash.8L78b7fw.dpbs