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What really helps me when solving is using a pen in a different color for the cells that *definitely* have to be empty. A lot of people only mark the filled cells and then miss where nothing can possibly go. If you have a row with "3" for example and it's 10 cells wide, you can already tell: the first two cells have to be empty, because the block of 3 needs at least one space. Narrowing down those empty cells is often the key to making progress when you're stuck on the obvious numbers.
Another trick: look at multiple rows and columns together instead of solving them in isolation. Sometimes a column you haven't completely figured out yet will help you, because now you know which cells in the row actually have to be black for sure. It's like mutual confirmation - you'd be surprised how fast some puzzles come together once you start thinking diagonally.
With nonograms, I always start with the rows and columns where the numbers basically give away most of the solution - so if the sum of the blocks plus gaps fills up almost the entire width, you can already fill in a lot. Then I systematically mark which squares definitely have to be black or white, and use logic: if a row only has a few possibilities left, I rule them out until only one fits. The most important thing is not to guess - if you're unsure about something, leave it and focus on the parts that are definitely solved, which then unlock the rest for you.
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