I have read a few introductory books and lost a few dozen games to Cosumi, but only just began playing fellow humans. Could a more experienced player quickly look through these games to advise which elementary concepts/shapes/sequences I am getting right, which I really need to work on and how to work on them?
What I did notice is that when I play on the 4-4 point, I cannot handle invasions on the 3-3 point (like 121 in game 4), and I sometimes lose small groups because I miss cutting moves (like 96 and 124 in game 2 as well as 99 in game 3), but I was really happy with how I dealt with the upper-right corner invasion in game 1. If I can tell when my groups and territory are secure (including the sequences for securing them), I will tenuki and invade more.
Black, lost by 40.5 vs 15 kyu, 149 moves
Black, lost by 56.5 vs 13 kyu, 171 moves
White, resigned vs 14 kyu, 103 moves
White, won by 26.5 vs 21 kyu, 163 moves