Meaning trap
go on
talk at length (often annoyingly)
To talk for a long time, especially in a way that is repetitive, boring, or annoying to others.

Don't mix these meanings
Same phrase, different job.
To talk for a long time, especially in a way that is repetitive, boring, or annoying to others.
'go on' also has the more basic meaning 'continue'; this is the advanced sense.
Hear it in context
Notice where the phrase sounds natural.
He tends to go on about his achievements, which can be exhausting to listen to.
Some people tend to go on about their personal experiences in group discussions, which can make it difficult for others to contribute.
Fix the pattern
One small grammar move makes it sound right.
Not: Stop going on for it.
Say: Stop going on about it.
'Go on ABOUT something' = talk too much about it, often with 'and on' for emphasis.
Which sounds natural?
Tap the one a native speaker would say.
'Go on (and on) about' carries the bored, 'too much' attitude. The neutral formal version misses the point.
Build natural chunks
Words that usually travel with it.
go on about
- about it
- and on
- about his car
- for ages
Don't confuse it
Related
Other meanings and phrases to compare.
- go on (continue) — 'go on' also has the more basic meaning 'continue'; this is the advanced sense.