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In real life, you can see these in steel structure. Axial release and shear release in slotted connection. And bending release you can have a look at you doors, there hinges are used to rotate it at the edges.

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Thanks for the suggestion! I'll consider it for my next video.

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For some cases it is needed. If load is given (magnitude doesnot matter, only direction is needed) then you should consider the direction of load, eg. In a beam vertical load is acting then its reaction and equilibrium equation will come accordingly. And if load is not given then you have to consider general case ( considering load in all direction) for that no. of equilibrium equation will be different.

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Yes. U r missing concept of extensible and inextensible member. If members are extensible then 3 dof and if inextensible then 2 dof.

Just notice that If "ALL" the external reactions are concurrent or parallel, then only the structure will become instable externally. But in this example, you can see all 3 reactions are not parallel neither concurrent. So it is externally stable. For the given truss system if you replace one side hinge support to roller support then it will 2 reactions ..both will be parallel to each other then structure will become unstable externally.

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For internal roller, moment and axial force will release and only shear force will come if you arrange the internal roller horizontally.

For degree of freedom concept, please refer kinematic indeterminacy series.

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