Pourty was worth the buy!
I didn't "train" at all, I was very lazy.
Well I say that but we had been given some potties that hung about in the bathroom. Around 2-2.5 he'd sit before a bath and occasionally a wee would come out. And then some celebrations! Didn't happen all the time, was just an occasional thing.
I also started at some point to talk about why I was sitting on the toilet so he got an idea. I let him flush it.
But I really couldn't do "training" on either as they'd resist.
In the end the eldest started to hate nappies, especially at night, so we tried pants. He was however dry from around 2 (so was youngest) so that worked well. He didn't move into pants till around 3.5 - we'd tried them occasionally in the house and he could do wees but it wasn't consistent. At 3.5 he was more able to talk about it too. We tried a few days in the summer with pants - feeling a poo really shocked him but he found that hard. You're not supposed to but I did use choc buttons for a while 😬
There was a phase where we put nappies on when out and pants in the house. Then just before term of the last year at nursery he decided himself and did really well.
Youngest was happy to try occasionally but then became completely resistant at home till at 3 and a quarter when his best friend at nursery was getting all the praise and he just decided to wear pants too one day. They'd been asking him to try and he did but he'd started to refuse at home completely from around 2.5. So I was surprised (but he's an own terms kid!)
I'd just bought a massive box of wipes that's still going two years later...