Easy problems to learn new shapes, hard problems to practice them.
This is a bit easier problem as you can read all the variations and just compare the results, no other special skills are really needed.
Just let your feeling be opened to accept this kind of solution. You will find it useful in more complicated positions.
(;AB[rb]AB[qb]AB[rc]AB[pc]AB[oc]AB[ob]AB[nb]AW[mc]AW[nc]AW[pa]AW[lc]AW[lb]AB[mb]AW[nd]AW[od]AW[pd]AW[qd]AW[qc]AW[rd]AW[re]AW[kb]AW[ma]C[Black to play the best endgame. Points are more important than ko threats, ko threats are more important than sente..]AP[goproblems]
(;B[pb];W[sc];B[sb];W[sd];B[na];W[la]C[Simply for the best result!RIGHT])
(;B[sd];W[se];B[sc];W[na];B[qa];W[oa];B[pb];W[la];B[sa]C[This was not a good action.])
(;B[sc];W[na];B[qa];W[oa];B[pb];W[la];B[sa];W[sd]C[This was not good.])
(;B[oa];W[sc];B[sb];W[sd]C[Compare this with the solution; this is one point worse.])
(;B[qa];W[na];B[pb];W[sc];B[sb];W[sd];B[oa];W[la]C[Two points worse than the solution.])
(;B[na];W[pb];B[la];W[sc]
(;B[sb];W[qa]C[This is an unhappy variation :-(])
(;B[qa];W[sb]C[:-( :-(])))