Strategy:

List the steps for solving this problem. Discuss your list with a neighbor.

Draw the FBD for the entire truss. Apply the equilibrium conditions and solve for the reactions at A and $L.$

Make a cut through members $FH,GH,$ and GI and take the right$-$hand section as a free body $($the left side would also be acceptable$).$

Determine the force in members $FH,GH,$ and GI$.$

Apply the conditions for static equilibrium to determine the desired member forces.