#2. Obviously, beer battered fish is not the only way to prepare fish for tacos, though it is my favourite
. Grilled or pan fried fish is an excellent option in fish tacos as well. Simply see which recipes below discuss grilled/pan-fried fish and google that cooking method for more information. Maybe a blackened style fish cook interests you (another riff).
I recommend reasonably good fresh white fish in my fish tacos but you can always riff. For me that often means local fish and stuff on sale. Haddock, cod or halibut for example. I'll use more premium options too such as walleye, trout, rainbow trout, etc. Maybe more Mexican-available fish such as mahi mahi, red snapper, etc. People use tuna. Salmon is a great option imo as a riff with lettuce, greens, avocado and cream cheese in the taco. The heavy smoked yellow cod fish tacos I've posted is quite a different riff. I've seen smoked salmon fish tacos too
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#3. IMO, a Baja style fish tacos recipe is the perfect recipe to start at. I love Baja style fish tacos. Beer battered fish (is most common) with cabbage, cream sauce and lime juice. It's amazing. Here are a few recipes that have caught my eye, but make battered fish instead of grilled imo for at least the first few cooks if that sounds most appealing. Use the beer batter recipe above and one of the recipes below for the slaw and cream parts, plus consider the additional or optional ingredients (e.g., avocado).
https://www.thekitchenwhisperer.net/2015/03/12/grilled-fish-soft-tacos-with-baja-cream-sauce/
https://natashaskitchen.com/fish-tacos-recipe/
https://www.foodnetwork.com/recipes/marcela-valladolid/baja-style-fish-tacos-recipe-2014136
Here's a simple baja fish taco recipe with over 250 reviews and high ratings.
https://www.onceuponachef.com/recipes/baja-fish-tacos.html
#4. General advice. That recipe is just a starting point for one style of fish taco and there are other options, styles and riffs. A tomato-based condiment is great instead of using a cream sauce. It can be diced tomatoes, salsa or pico de gallo, all of which will work very well. Consider a combination of premium store salsa with added diced garden tomatoes and onions; it's very easy, fast and fresh. I look forward to using Mexican adobo sauce and mole sauce (shown in a few of my older posts posts) in fish taco meals
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Typical associated ingredients used in conjunction with tomato-based condiments in fish tacos include lettuce, cheeses, avocado, hot sauce, greens, jalapenos, etc. Fresh cilantro or Italian parsley can be a great ingredient. Let your imagination run. I've tried a mango salsa, pickles, etc. Maybe corn interests you. Much of what you see with my cooks is what I have around the house on hand. And I highly recommend never forgetting plenty of fresh squeezed lime or lemon juice on every fish taco :agave:.
Hope that helps. I try to fit in fish cooks regularly since they are so healthy. I've been doing a pretty good job of that this year and it's been great. Go for it as much as you can I say.
Cheers!