Your requested theme is "walls". Here are some comments about your "building walls" and "using walls".
1) Building wallsGood: 63
Can do better: 41, 67-75, 79, 115
2) Using wallsgood playing away from walls: 55, 77, 87, 107, 127
can do better in playin away from walls/strength: 57, 59, 79, 99, 131
In detail:
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[-5.50]
PW[oyaji1951]PB[paK0]WR[8k]BR[9k]DT[2018-02-25]PC[IGS-PandaNet]C[Your requested theme is "walls". I'll talk about your "building walls" and "using walls.
1) Building walls
Good: 63
Can do better: 41, 67-75, 79, 115
22) Using walls
good playing away from walls: 55, 77, 87, 107, 127
can do better in playin away from walls/strength: 57, 59, 79, 99, 131
]RE[W+Resign]
;B[pd]
;W[dp]
;B[pp]
;W[dc]
;B[de]
;W[cd]
;B[ce]
;W[bd]
;B[be]
;W[cg]
;B[ec]
;W[dd]
;B[ed]
;W[ee]LB[cg:A]C[This is a tough cut because White has a stone at the vital point]
;B[ef]
;W[fe]
;B[dg]
(;W[ch]
(;B[gc]C[bad shape]
;W[gd]
;B[hc]C[This move does not work]
(;W[dh]
;B[ff]
;W[gf]
;B[fh]
;W[eg]
;B[df]
;W[fg]
;B[gg]
;W[eh]
;B[hf]
;W[ge]
;B[he]C[Now the snapback is removed]
(;W[gh]
;B[hg]
;W[eb]
;B[fc]
;W[bf]
(;B[hd]C[You can cut]
;W[ae]
(;B[fd]C[A 24 point move. But; let's look at the alternative: building a bigger wall.]
;W[fi]TR[hc][hd][he][hf][hg]SQ[ch][dh][eh][fh][gh]C[The walls are equivalent
But you have sente and one stone more on the board]
;B[fq]
;W[eq]
;B[fp]
;W[er]
;B[do]
;W[cp]
;B[eo]
;W[co]
;B[qf]
;W[nc]
;B[oc]
;W[od]
;B[pc]
;W[md]
(;B[oe]C[Too close]
;W[nb]
(;B[nd]LB[pc:A]C[Now A loses its use]
;W[ld]
;B[jp]
;W[hq]
;B[hp]LB[er:A]C[Good: the lower side is small due to A]
;W[iq]
;B[ip]
;W[jq]
(;B[kp]C[You should consider hane]
;W[kq]
;B[lp]
;W[lq]
;B[mp]
;W[mq]
;B[np]
;W[nq]
;B[oq]
;W[fr]LB[bb:A][rc:D][bq:C][qq:B][kr:E]C[A = B
C = D
White has E+ komi
You have a wall]
;B[pj]
;W[oo]
(;B[op]C[1. when you are strong, think attack, not defence]
;W[ql]
;B[qk]
;W[rk]
;B[rj]
;W[pk]
;B[qj]
;W[pl]
;B[qn]C[good]
;W[rm]
;B[nk]
;W[oj]
;B[ok]
;W[oi]
;B[qh]
;W[ph]
;B[qg]
;W[rn]
;B[ro]
;W[qo]
(;B[qp]C[When you have a wall, don't play close to the wall]
;W[po]
;B[rp]
;W[no]
;B[pn]
;W[on]
;B[lk]
;W[sj]
;B[mf]C[ood!]
;W[mj]
;B[mk]
;W[li]
;B[ii]
;W[ji]
;B[ij]
;W[jj]C[PLay away from the wall]
(;B[kf]
;W[kk]
;B[lm]
;W[ll]
;B[ml]
;W[kl]
;B[mm]
;W[ik]
;B[il]
;W[hk]
;B[hh]
;W[im]
;B[lb]
;W[kb]
(;B[jb]
;W[kc]
(;B[jc]C[Last comment: see var]
;W[ja]
;B[ia]
;W[ka]
;B[hb]
;W[ob]
;B[pb]
;W[mb]
;B[lc]
;W[ke]
;B[la]
;W[kd]
;B[oa]
;W[na]
;B[pa]
;W[lf]
;B[lg]
;W[ne]
;B[od]
;W[nf]
;B[ng]
;W[me]
;B[mg]
;W[og]
;B[kg]
;W[of]
;B[nh]
;W[pi]
;B[qi]
;W[mi])
(;B[ka]))
(;B[kc]
;W[lc]
;B[jb]
;W[mb]
;B[ka]))
(;B[jk]
;W[kf]
;B[ke]
;W[lf]
;B[le]
;W[me]
;B[mg]
;W[je]
;B[kh]
;W[jh]
;B[jg]))
(;B[rp]
;W[po]
;B[om]LB[qp:A]C[You would not play A now]
;W[pm]
;B[sk]
;W[rl]
;B[nm]))
(;B[po]
;W[op]
;B[or]))
(;B[kq]
;W[kp]C[Can white cut?]
;B[lq]LB[ko:A][fr:B]C[No]))
(;B[mf]C[Drive towards the wall]))
(;B[of]))
(;B[fi]
;W[cf]
;B[hi]))
(;B[ae]))
(;W[fc]
;B[hd]
;W[eb]
;B[fd]))
(;W[fc]
(;B[fb]
;W[eb]
;B[fd]
;W[fc])
(;B[eb]
;W[fb]
;B[db]
;W[cb])))
(;B[gd]C[This is the shape point]))
(;W[gc]
;B[ch]))