I know this is not a Christian community, but I recently discovered Tachiyomi looking for alternatives to Saikou and a good alternative to read manga (which I don't do much, but it makes me curious) is Tachiyomi and although installing extensions is really simple the vast majority have NSFW content (or hentai?) and Jesus, I want to look for Pokemon manga and if I install extensions randomly I end up finding things I'd rather not have seen before, and many SFW extensions "don't work" or give an error that something went wrong.
Thanks for this question, OP! I made the mistake of asking this question on Tachiyomi's discord and they were very unpleasant about it (and apparently they don't want people using all the same extensions too).
Some have already been mentioned here but currently I have been using:
MangaDex (I still don't know how to make NSFW titles appear tho)
Thanks for the answer, some of the extensions you said actually had not been mentioned.
I know this question is out of the scope of this post at first, but what manga do you recommend? I know it's something super offtopic but honestly Tachiyomi (with the right extensions) has a huge selection of manga, and I find it interesting to start reading manga.
I haven't read manga for years and I barely watch anime sometimes, but I like anime (and consequently, manga) like Berserk, Fairy Tail, Full Metal Alchemist, One Punch Man, etc.
Tachiyoni has been great, I use MangaDex for almost everything, Colored Manga and Comick are nice too. Check out Vagabond, Vinland Saga and Parasyte. You can find Parasyte in full color too.