Understanding Welding Symbols on Blueprints

I’ve noticed many newcomers struggle with interpreting welding symbols on blueprints. For instance, knowing the difference between a filled triangle and an open one can drastically affect the joint design. What tips do you all have for mastering these critical details? I often use a reference guide, but I’d love to hear different approaches.

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍‌⁠‌⁠‌⁠‌‍‍‍​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠‌‌⁠⁠‌⁠‌​‌‍⁠⁠‌⁠​​‌‍‍‌‌‍​⁠​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠​‍​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‍​⁠​​​⁠‌⁠​⁠​​​⁠‌‌​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍​‍⁠‌‌⁠​‌‌‍​‍‌⁠‌​‌‍​⁠​⁠‌​​⁠‌‌‌​‌​‌​​⁠‌‌​‍​⁠‌⁠‌‍‍​‌‌⁠⁠‌‌‌​‌‍‌‌‌‍⁠‍​‍​‍‌⁠⁠‌​​