My 2 yo had a handful of words, had an extra hearing test (had 2 at birth - this one was fine again too), but nearing 3 he suddenly leapt into talking. It was an explosion like a few new words everyday for weeks, then stringing them together, but then new ones we didn't know he knew would slip in casually too (correctly in context), and not be repeated for ages.
He could count to 20 before he could string 2 words together though, we counted a lot while walking. I think that's good practice, and easier for them as 1 streetlamp/car/banana is always 1, for example. Gets them practising syllables without having the stress of remembering meanings. 1 is always 1.
We were given conflicting advice about narrating as per @MistyFrequencies . I was first told to narrate everything, then 6 months later was told of course he wouldn't learn with my constant chatter, I needed to slow it down and just use 1 or 2 words (car, red car). I don't know what helped in the end, maybe just time. He was walking at 8 months though. He still now at 4.5 has a few issues with hard letters (r, s, y), but he's understood fine.
I love seeing his development still. He's learned this week, 'just joking.' As in 'I want some water... just joking.... I want some water.. just joking' over and over...