How to Start for Beginners
For anyone unsure which line to tackle first.
At first, look at the lines whose clue numbers add up to the most — the lines with many cells to fill. They have little freedom, so confirmed cells appear quickly.
Find a line where a single block's length is more than half the line's length and apply overlap to easily fill the first cells. The cells you confirm this way spread information to the crossing lines.
Start with small 5×5 puzzles to get comfortable with reading clues and marking X, then increase the size and your skill will naturally grow.