Connemara vs. Ulster: Does it matter for a beginner?

I’m an absolute beginner and I keep bouncing between apps that seem to teach totally different dialects. One lesson tells me to pronounce things one way, and the next lesson uses a completely different regional variant. It's making it impossible to stick to a routine because I feel like I'm learning two different languages. Should I just pick one and ignore the others, or is there a 'standard' Irish I should aim for first?