Minecraft tips
Signs can be used as bedframes
Don't burn down a pillager outpost (they get kinda mad...)
Placing torches under waterlogged slabs illuminates the place. Awesome for lighting caves!
From the Update Aquatic on, items float in water. Besides it being useful to locate lost items, you can use it to simulate littered waters (trash floating in the water).
The last part of the tip might be for just a niche audience, but with command blocks you could create items with no despawn rate and use it as decoration for environment-unfriendly areas like waterpipes dumping trash and water into a lake.
Something about reinforcement zombies people who play on hard mode should be careful of.
Reinforcement zombies Don't only have the different spawning condition of being able to spawn in light level 9. They can also spawn on bedrock, and on things that mobs normally can't spawn on, like redstone and pressure plates. If you have a spot that's covered by redstone, a pressure plate, or it's over bedrock, remember that reinforcement zombies can still spawn there unless the light level is at least 10.
Soul Sand Barriers Help Keep You From Falling Off A Path. That's All.
Blaze Farm.
If you put glass as the floor of your blaze farm, whenever they shoot their fireballs the glass will not catch on fire, because glass won't ignite. This is very helpful if you keep losing experience/blaze rods from the fires that they create!
Use an arrow of decay as an ink pen
When Using Sandstone, Use ALL variations of it to make it seem more real and less boring.
Collecting wood.
This is tip may seem useless, but coming from a particularly lazy person, it's saved me a lot of time. When you're chopping down a tree, break the bottom block last so you can jump on it if theres one or two out of your reach. This saves you the trouble of putting down a new block to jump on, and reduces the amount of floating trees that clutter your world.