From CSDN to a site of my own

From the summer of 2025 until now, my learning log has lived on CSDN — about twenty posts in total.

The first half was fundamentals: Python data structures, NumPy and pandas, then data analysis and visualization, with a few competitions and small projects in between. The second half turned to AI: starting from transformers and working through tool calling, the agent loop, multi-agent setups, prompt / context / harness, then Claude Code, LLM training and fine-tuning, and engineering problems like prompt-injection defences and agent checkpoints.

Now all of it moves to my own site, and that is where the blog goes from here. The old CSDN posts stay online (my profile) — they just stop updating.

Different address, same thing written: explain what I learned clearly enough to check whether I actually understood it.