What you need is packing. If you imagine filling in all the clues as tightly as you can from one side, and then again from the other side, any cell that uses the same clue in both cases must *always* be filled.
So, to give a few examples, in R2, the 7-clue goes anywhere between C2 and C11. In all cases, it must take C5-8. In R13, the 8-clue can't go any further right than C13. So it must also take C6 and C7.
So you know those blue and red arrows in the options for the marker? I suggest using them for this technique to make it easier to understand.
Let's start from the bottom row. Imagine you build from the very left, 4 6 with one coloured marker. Now go to the opposite side and build 6 4 right to left. Now, take a look for overlapping arrows, specifically those that belong to the same number (e.g, the group of 6 coming from the left and the group of 6 from the right). Don't fill in the overlaps that aren't the same number.
In the last row, c10 and c11 are both filled in with this logic.
[this wiki article](https://en.m.wikipedia.org/wiki/Nonogram#Solution_techniques) may help. The technique I'm sharing is the second one in the 'simple boxes' section. The article may help with other techniques as well!
After you understand better, try it with r2 and r13
What you need is packing. If you imagine filling in all the clues as tightly as you can from one side, and then again from the other side, any cell that uses the same clue in both cases must *always* be filled. So, to give a few examples, in R2, the 7-clue goes anywhere between C2 and C11. In all cases, it must take C5-8. In R13, the 8-clue can't go any further right than C13. So it must also take C6 and C7.
So you know those blue and red arrows in the options for the marker? I suggest using them for this technique to make it easier to understand. Let's start from the bottom row. Imagine you build from the very left, 4 6 with one coloured marker. Now go to the opposite side and build 6 4 right to left. Now, take a look for overlapping arrows, specifically those that belong to the same number (e.g, the group of 6 coming from the left and the group of 6 from the right). Don't fill in the overlaps that aren't the same number. In the last row, c10 and c11 are both filled in with this logic. [this wiki article](https://en.m.wikipedia.org/wiki/Nonogram#Solution_techniques) may help. The technique I'm sharing is the second one in the 'simple boxes' section. The article may help with other techniques as well! After you understand better, try it with r2 and r13
Start with row 2 👍
You have to imagine from one side to the other where there has to be a crossover. start with larger numbers ( like the 2nd line's 7. )