...but looking in, say, the US database, the German database, or the WIPO database, is going to be less helpful for you, for a couple of reasons.
The first reason is that domainers tend to look for the wrong things anyway. An example of this is here:
https://www.namepros.com/threads/recently-aquired-domain-slightly-concerned-about-copyright.1104894/
In that thread, the poster wanted to know if "skyhigh security" was a trademark, and did a US trademark search for "skyhigh security" instead of checking whether "skyhigh" by itself was a registered mark for security products. So, if you are unfamiliar with how to check partial words, variants, or boolean search operations, then you are unlikely to find relevant results anyway.
The second reason is that domainers seldom know how to interpret what the database results are telling them. There are lots of things in these database other than "trademarks". Domainers typically cannot tell the difference between applications that are use-based or intent-to-use based, applications that are refused and abandoned, registrations which may have simply not been renewed as an oversight, or any of the various types of things that might turn up as a result of using these databases. All of the various data fields in a trademark database record may, or may not, mean something important. For example, a common question here at Namepros is the meaning of the "LIVE" or "DEAD" status indicator in a USPTO database record. The unfortunate answer, which is mostly ignored, is that the "LIVE" or "DEAD" status might mean any of several things, depending on other information in the record or accessible via the TSDR database linked to the TESS database record.
So, that said, have fun! But, honestly, for most purposes, Google is a better bet than anything that people have mentioned in this thread. Once you get over the common, and wrong, belief among people in this forum that trademark registration is a necessary incident to "having a trademark", then you will understand why Google makes the most sense.