One of the biggest rule of tachiyomi is to not share sources. Sharing it especially on a crowded forum like this can increase the traffic and make the source block tachiyomi.

Here how I get a good source: - I follow the watermark of the thing I'm reading, often the scanlation team have their own website and it has an extension available for it. - The scanlation team put the first chapters on mangadex (maybe as an ad ?), once I get their name, same thing, I'll try to directly get from them.