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Use equilibrium equations to solve for unknow values

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The number of unkowns is equal to the number of members + all the reactions

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The number of equilibrium equations is equal to the number of joints * 2

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If the number of unkowns is greater than the number of equilibrium equations the  truss is not statically determinate. If the number of unkowns and equilibrium statements are equal try to determine more unknowns and determine if the truss is fixed

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Input results back into FBD and equilibrium equations and make sure equations are correct

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Planar trusses have 3 equilibrium statements: sumation of Fx, Fy, and Mz

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Forces are applied only at the joints.

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Draw FBDs and write equilibrium statements for all joints in order to determine unknowns

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Identify which joints have aligned members, if there is a 3rd unaligned member that is a zero force member

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Try to make a cut through less than 4 unkown members, make multiple cuts if needed

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Cutting a truss into smaller sections to determine internal forces

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Treat the Truss as a singular Rigid Body in order to solve for reaction and external forces. You are able to create 3 equilibrium statements.

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Evaluate the forces acting on a single point in the x and y directions. This should give you two equations, one for Fx and one for Fy