Welcome
groston!
It does appear there are techniques you are missing since those puzzles get a SudokuSolver score of
0.85, which is very, very low compared to our normal fare on this forum.
My suggestion is to download
SudokuSolver and let it show you how to solve those puzzles. Please read that thread also to make the best use of that software. Especially, use and save the "Scoring" techniques list to step through the puzzle. That way, the score and what techniques are being used will match up.
Here are the stats on those two puzzles. You can use the code to paste into the software above. Feel free to post here with the many questions you will undoubtedly have as you learn!!
The 18 June puzzle has some nice big cages!
Cheers
Ed