Thanks for playing! Was it today's board? Friday's is on the harder side. If you want a simpler board you can try Monday's or Tuesday's (this one has quite an interesting shape in terms of your question about techniques).

Some interesting strategies come from the irregular region shapes. For example, you may notice that all 2s a region needs can only go in one row. If other regions have cells in that row, that often forces these cells to be a 1 or a 4 (or a 3 for 6x6 boards).